diff --git a/.gitea/workflows/build-dev.yml b/.gitea/workflows/build-dev.yml
index dd685ba..6b8bc7d 100644
--- a/.gitea/workflows/build-dev.yml
+++ b/.gitea/workflows/build-dev.yml
@@ -1,51 +1,91 @@
-name: Build Dev ISO
-
+name: Build Dev ISOs
 on:
   workflow_dispatch:
   push:
     branches:
       - dev
-
 env:
   NIX_CONFIG: |
     extra-substituters = https://attic.radiantwavetech.com/radiantwave-dev
     extra-trusted-public-keys = radiantwave-dev:B8FhLu3MQ9JfeEIHIKNrKxnP+3akzzkqMbTZR4hRfj0=
-
 jobs:
-  build-dev-iso:
+  build-dev-kiosk:
     runs-on: build-server
-
     steps:
       - name: Clone Repository
         run: git clone --depth 1 --no-single-branch ssh://git@gitea.radiantwavetech.com:2222/RadiantWaveTech/KioskConfig.git .
-
       - name: Checkout dev branch
         run: git checkout dev
-
       - name: Prepare output directory
         run: mkdir -p /home/user/radiantwave
-
-      # --- Kiosk ISO ---
-      - name: Build kiosk ISO
+      - name: Build dev kiosk ISO
         run: |
           export NIXPKGS_ALLOW_UNFREE=1
           . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
-          nix build -L --impure .#nixosConfigurations.dev-iso.config.system.build.isoImage
-
-      - name: Rename kiosk ISO
+          nix build -L --impure .#nixosConfigurations.kiosk-iso.config.system.build.isoImage
+      - name: Rename dev kiosk ISO
         run: |
           ISO_DATE=$(date +%Y-%m-%d_%H-%M-%S)
-          FILENAME="radiantwave-kiosk-dev-iso-${ISO_DATE}.iso"
+          FILENAME="radiantwave-kiosk-dev-${ISO_DATE}.iso"
           cp -L result/iso/*.iso "/home/user/radiantwave/${FILENAME}"
-          echo "KIOSK_ISO_FILENAME=${FILENAME}" >> "$GITHUB_ENV"
-
-      - name: Move old dev images to archive
-        run: tools/archive-images.sh nclack@157.245.124.103 /mnt/infrastructure_data/files/images /mnt/infrastructure_data/files/images/archives 'radiantwave-kiosk-dev*'
-
-      - name: Copy kiosk ISO to fileserver
+          echo "FILENAME=${FILENAME}" >> "$GITHUB_ENV"
+      - name: Copy dev kiosk ISO to fileserver
         run: |
-          scp "/home/user/radiantwave/${KIOSK_ISO_FILENAME}" \
+          scp "/home/user/radiantwave/${FILENAME}" \
             radiantwave-infra:/mnt/infrastructure_data/files/images/
+      - name: Cleanup
+        run: rm -f "/home/user/radiantwave/${FILENAME}"
 
-      - name: Cleanup kiosk ISO
-        run: rm -f "/home/user/radiantwave/${KIOSK_ISO_FILENAME}"
+  build-dev-android:
+    runs-on: build-server
+    steps:
+      - name: Clone Repository
+        run: git clone --depth 1 --no-single-branch ssh://git@gitea.radiantwavetech.com:2222/RadiantWaveTech/KioskConfig.git .
+      - name: Checkout dev branch
+        run: git checkout dev
+      - name: Prepare output directory
+        run: mkdir -p /home/user/radiantwave
+      - name: Build dev android ISO
+        run: |
+          export NIXPKGS_ALLOW_UNFREE=1
+          . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
+          nix build -L --impure .#nixosConfigurations.android-iso.config.system.build.isoImage
+      - name: Rename dev android ISO
+        run: |
+          ISO_DATE=$(date +%Y-%m-%d_%H-%M-%S)
+          FILENAME="radiantwave-android-dev-${ISO_DATE}.iso"
+          cp -L result/iso/*.iso "/home/user/radiantwave/${FILENAME}"
+          echo "FILENAME=${FILENAME}" >> "$GITHUB_ENV"
+      - name: Copy dev android ISO to fileserver
+        run: |
+          scp "/home/user/radiantwave/${FILENAME}" \
+            radiantwave-infra:/mnt/infrastructure_data/files/images/
+      - name: Cleanup
+        run: rm -f "/home/user/radiantwave/${FILENAME}"
+
+  build-dev-commercial:
+    runs-on: build-server
+    steps:
+      - name: Clone Repository
+        run: git clone --depth 1 --no-single-branch ssh://git@gitea.radiantwavetech.com:2222/RadiantWaveTech/KioskConfig.git .
+      - name: Checkout dev branch
+        run: git checkout dev
+      - name: Prepare output directory
+        run: mkdir -p /home/user/radiantwave
+      - name: Build dev commercial ISO
+        run: |
+          export NIXPKGS_ALLOW_UNFREE=1
+          . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
+          nix build -L --impure .#nixosConfigurations.commercial-iso.config.system.build.isoImage
+      - name: Rename dev commercial ISO
+        run: |
+          ISO_DATE=$(date +%Y-%m-%d_%H-%M-%S)
+          FILENAME="radiantwave-commercial-dev-${ISO_DATE}.iso"
+          cp -L result/iso/*.iso "/home/user/radiantwave/${FILENAME}"
+          echo "FILENAME=${FILENAME}" >> "$GITHUB_ENV"
+      - name: Copy dev commercial ISO to fileserver
+        run: |
+          scp "/home/user/radiantwave/${FILENAME}" \
+            radiantwave-infra:/mnt/infrastructure_data/files/images/
+      - name: Cleanup
+        run: rm -f "/home/user/radiantwave/${FILENAME}"
diff --git a/.gitea/workflows/build-prod-android.yml b/.gitea/workflows/build-prod-android.yml
index 7b4912f..3770704 100644
--- a/.gitea/workflows/build-prod-android.yml
+++ b/.gitea/workflows/build-prod-android.yml
@@ -33,10 +33,6 @@ jobs:
           cp -L result/iso/*.iso "/home/user/radiantwave/${FILENAME}"
           echo "ANDROID_ISO_FILENAME=${FILENAME}" >> "$GITHUB_ENV"
 
-      # - name: Move old android images to archive
-      #   run: |
-      #     ssh nclack@157.245.124.103 'mv /mnt/infrastructure_data/files/images/radiantwave-android-iso* /mnt/infrastructure_data/files/images/archives/'
-
       - name: Copy android kiosk ISO to fileserver
         run: |
           scp "/home/user/radiantwave/${ANDROID_ISO_FILENAME}" \
diff --git a/.gitea/workflows/build-prod-commercial.yml b/.gitea/workflows/build-prod-commercial.yml
index d130db4..59134d1 100644
--- a/.gitea/workflows/build-prod-commercial.yml
+++ b/.gitea/workflows/build-prod-commercial.yml
@@ -33,10 +33,6 @@ jobs:
           cp -L result/iso/*.iso "/home/user/radiantwave/${FILENAME}"
           echo "COMMERCIAL_ISO_FILENAME=${FILENAME}" >> "$GITHUB_ENV"
 
-      # - name: Move old commercial images to archive
-      #   run: |
-      #     ssh nclack@157.245.124.103 'mv /mnt/infrastructure_data/files/images/radiantwave-commercial-iso* /mnt/infrastructure_data/files/images/archives/'
-
       - name: Copy commercial kiosk ISO to fileserver
         run: |
           scp "/home/user/radiantwave/${COMMERCIAL_ISO_FILENAME}" \
diff --git a/.gitea/workflows/build-prod-kiosk.yml b/.gitea/workflows/build-prod-kiosk.yml
index 8a5d69d..e5e89ef 100644
--- a/.gitea/workflows/build-prod-kiosk.yml
+++ b/.gitea/workflows/build-prod-kiosk.yml
@@ -33,10 +33,6 @@ jobs:
           cp -L result/iso/*.iso "/home/user/radiantwave/${FILENAME}"
           echo "KIOSK_ISO_FILENAME=${FILENAME}" >> "$GITHUB_ENV"
 
-      # - name: Move old kiosk images to archive
-      #   run: |
-      #     ssh nclack@157.245.124.103 'mv /mnt/infrastructure_data/files/images/radiantwave-home* /mnt/infrastructure_data/files/images/archives/'
-
       - name: Copy kiosk ISO to fileserver
         run: |
           scp "/home/user/radiantwave/${KIOSK_ISO_FILENAME}" \
diff --git a/.gitea/workflows/build-prod-rpi.yml b/.gitea/workflows/build-prod-rpi.yml
index bb267ce..609ac5e 100644
--- a/.gitea/workflows/build-prod-rpi.yml
+++ b/.gitea/workflows/build-prod-rpi.yml
@@ -30,9 +30,6 @@ jobs:
           cp -L result/sd-image/*.img.zst "/home/user/radiantwave/${FILENAME}"
           echo "RPI_IMAGE_FILENAME=${FILENAME}" >> "$GITHUB_ENV"
 
-      - name: Move old Raspberry Pi images to archive
-        run: tools/archive-images.sh nclack@157.245.124.103 /mnt/infrastructure_data/files/images /mnt/infrastructure_data/files/images/archives 'radiantwave-rpi*'
-
       - name: Copy Raspberry Pi image to fileserver
         run: |
           scp "/home/user/radiantwave/${RPI_IMAGE_FILENAME}" \
diff --git a/AGENTS.md b/AGENTS.md
index b4b741f..589965f 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -8,10 +8,12 @@ Hosted on Gitea: `https://gitea.radiantwavetech.com/RadiantWaveTech/KioskConfig`
 
 ## Prod/dev split
 
-Single branch (`main`) for this repo. The production vs. dev split is at the **flake input + upgrade ref** level:
+Two branches — `main` (prod) and `dev`. There are **no `-dev` configs**: each hardware target has exactly one config, and the branch selects its channel via the single `channel` block at the top of `flake.nix`:
 
-- Production variants consume the `radiantwave` input (`?ref=main`) and auto-upgrade from `KioskConfig.git#<config>` on `main`.
-- `-dev` variants consume the `radiantwave-dev` input (`?ref=dev`) and auto-upgrade from `KioskConfig.git?ref=dev#<config>-dev`.
+- `main`: `channel.appInput = radiantwave` (main), `atticRepo = "radiantwave"`, `gitRef = ""` (default branch).
+- `dev`: `channel.appInput = radiantwave-dev`, `atticRepo = "radiantwave-dev"`, `gitRef = "?ref=dev"`.
+
+Everything downstream (the configs, ISOs, updater module, autoUpgrade refs) reads from `channel`, so a `dev`→`main` merge carries your changes automatically — no copying between sibling configs. To flip a channel, change only those three `channel` values. When merging, reconcile just this one block.
 
 Both gitea repos are public: all git access is plain HTTPS (`git+https://...`), no SSH keys or access tokens on the kiosks. Don't reintroduce `git+ssh` URLs in flake/upgrade refs.
 
@@ -36,16 +38,16 @@ nix eval .#nixosConfigurations --apply builtins.attrNames
 
 ## Config variants
 
+One config per hardware target. Dev/prod is the branch, not the config — see `channel` in `flake.nix`:
+
 | Name | Target hardware | Disk device | App input |
 |---|---|---|---|
 | `radiantwavekiosk` | Intel NUC 14 (NVMe) | `/dev/nvme0n1` | `radiantwave` (main) |
-| `radiantwavekiosk-dev` | Intel NUC 14 (NVMe) | `/dev/nvme0n1` | `radiantwave-dev` (dev) |
 | `radiantwavekiosk-commercial` | Commercial HW (SATA) | `/dev/sda` | `radiantwave` (main) |
-| `radiantwavekiosk-commercial-dev` | Commercial HW (SATA) | `/dev/sda` | `radiantwave-dev` (dev) |
 | `radiantwavekiosk-android` | Intel NUC 14, rotated display | `/dev/nvme0n1` | `radiantwave` (main) |
-| `radiantwavekiosk-android-dev` | Intel NUC 14, rotated display | `/dev/nvme0n1` | `radiantwave-dev` (dev) |
 | `radiantwavekiosk-rpi` | Raspberry Pi 5 (SD image) | — | `radiantwave` (main) |
-| `radiantwavekiosk-rpi-dev` | Raspberry Pi 5 (SD image) | — | `radiantwave-dev` (dev) |
+
+On the `dev` branch, the same four configs use `radiantwave-dev` and track `?ref=dev`.
 
 Every variant sets its own `networking.hostName` (same as the config name) and `system.configurationRevision`, so `tools/find_systems.zsh` can identify fleet members.
 
@@ -56,11 +58,10 @@ Each ISO installs exactly one closure using that closure's disk layout (`mkIso`
 | ISO | Installs | Disk layout |
 |---|---|---|
 | `kiosk-iso` | `radiantwavekiosk` | NVMe (`disk-config.nix`) |
-| `dev-iso` | `radiantwavekiosk-dev` | NVMe |
 | `commercial-iso` | `radiantwavekiosk-commercial` | SATA (`commercial-disk-config.nix`) |
-| `commercial-dev-iso` | `radiantwavekiosk-commercial-dev` | SATA |
 | `android-iso` | `radiantwavekiosk-android` | NVMe |
-| `android-dev-iso` | `radiantwavekiosk-android-dev` | NVMe |
+
+These same names build **dev-flavored** images when the flake is checked out on the `dev` branch (the channel block selects the dev app, attic repo, and upgrade ref), so there are no separate `-dev` ISOs.
 
 The installer lives once in `zero-touch-installer.nix` and is parameterized by `targetConfig`. Adding a new variant = add the `nixosConfigurations.*` entry, a matching `packages.x86_64-linux.*` line, and an ISO if needed.
 
@@ -91,18 +92,19 @@ Regenerate when major hardware changes, not on a schedule — reports are snapsh
 
 - **Disk device differs by variant**: `disk-config.nix` uses `/dev/nvme0n1`, `commercial-disk-config.nix` uses `/dev/sda`. `mkIso` pairs each ISO with the correct layout automatically — keep new ISOs paired correctly.
 - **Changing a config name** requires updating that config's `upgradeFlakeRef` in `flake.nix` (it embeds the name).
+- **The `channel` block is the dev/prod toggle** in `flake.nix` — `appInput`, `atticRepo`, `gitRef`. When merging `dev`→`main`, keep this block's values for the target branch; only this block differs between branches.
 - **`rotated_display.nix` uses `mkForce`** on `loginShellInit` — it replaces the entire kiosk startup script from `configuration.nix`; don't edit both.
 - **Auto-update**: `system.autoUpgrade` runs every 10 min (`*:00/10`) with `--refresh`, operation `switch`, no auto-reboot. A `radiantwave-backup` rsync runs before each attempt. The health-check/rollback service is written but commented out in `configuration.nix`.
 - **No binary cache**: kiosks fetch from cache.nixos.org only and compile RadiantWave itself from source during upgrades. Attic integration was planned (see `PLAN-update-system.md`) but never wired; the old netrc/JWT setup has been removed.
 - **Secrets**: none in-tree anymore (gitea repos are public). If either repo goes private, re-add auth via `nix.settings.access-tokens` in `configuration.nix`.
-- **Flake inputs**: `radiantwave` tracks main, `radiantwave-dev` tracks `?ref=dev`; prod and `-dev` configs consume them respectively. Updating them independently is intentional.
+- **Flake inputs**: `radiantwave` tracks main, `radiantwave-dev` tracks `?ref=dev`. The `channel` block picks which one the configs consume. Updating them independently is intentional.
 - **SSH keys on machines are inbound-only** (`authorizedKeys` for admin access); outbound git is HTTPS. The root key in `zero-touch-installer.nix` must stay in sync with `myKey` in `configuration.nix`.
 
 ## File map
 
-- `flake.nix` — entry point: inputs, builders (`mkKioskSystem`, `mkRpiKioskSystem`, `mkIso`), all system definitions, facter report wiring
+- `flake.nix` — entry point: inputs, the `channel` dev/prod selector, builders (`mkKioskSystem`, `mkRpiKioskSystem`, `mkIso`), all system definitions, facter report wiring
 - `configuration.nix` — shared NixOS config (packages, services, kiosk user, auto-upgrade, health check, VM variant)
-- `zero-touch-installer.nix` — parameterized USB installer module used by all six ISOs
+- `zero-touch-installer.nix` — parameterized USB installer module used by all three ISOs
 - `disk-config.nix` — NVMe disk layout (NUC)
 - `commercial-disk-config.nix` — SATA disk layout (commercial HW)
 - `rotated_display.nix` — portrait display override for Android variant
diff --git a/UPDATES.md b/UPDATES.md
new file mode 100644
index 0000000..4dae974
--- /dev/null
+++ b/UPDATES.md
@@ -0,0 +1,19 @@
+Implementation complete and verified. Here's what was done:
+Implemented (both repos on dev)
+Checkpoints (return points if something fails):
+- radiantwave → tag pre-live-update @ d84307b
+- KioskConfig → tag pre-live-update @ b8d0f59
+radiantwave — .gitea/workflows/dev.yml: Added a "Publish manifest" step after the Attic push. It writes {"version","storePath"} using readlink -f ./result-pkg (the exact closure pushed to the dev Attic), then scps it to radiantwave-infra:/mnt/infrastructure_data/files/radiantwave-dev/manifest.json. main.yml untouched.
+KioskConfig:
+- New radiantwave-updater.nix module: tmpfiles seed (L /var/lib/radiantwave/current → <baked-in baseline>), a systemd oneshot service (curl manifest → nix copy --from dev Attic, never builds → atomic mv -T swap), and a 2-min persistent timer.
+- flake.nix: imports the module in both builders and enables it on all 4 -dev variants (radiantwavekiosk-dev, -commercial-dev, -android-dev, -rpi-dev) pointing at the dev manifest/attic.
+- configuration.nix: launches via /var/lib/radiantwave/current/bin/radiantwave when the updater is enabled; prod keeps /run/current-system/sw/bin/radiantwave.
+Verified
+- All dev configs evaluate with enable=true; prod enable=false, no updater service/timer, login path unchanged.
+- Rendered service script correct (escaped shell vars, resoled Nix ínterps); dev login line + tmpfiles seed rule confirmed.
+- All 14 nixosConfigurations evaluate; toplevel dry-run of radiantwavekiosk-dev plans cleanly.
+- dev.yml parses as valid YAML with the new step.
+Before this actually works end-to-end, you need to
+1. Create /mnt/infrastructure_data/files/radiantwave-dev/ on the infra host and confirm it's served as https://files.radiantwavetech.com/radiantwave-dev/manifest.json.
+2. Commit + push these changes (I staged radiantwave-updater.nix so nix can see it; nothing is committed yet) — push dev.yml change to radiantwave dev, and the KioskConfig changes to dev. The dev-iso/etc. workflows will then bake the seed in.
+Note: git add radiantwave-updater.nix was needed for flake evaluation; the KioskConfig changes are staged but uncommitted. Want me to commit them?
\ No newline at end of file
diff --git a/android-kiosk-edid.bin b/android-kiosk-edid.bin
new file mode 100644
index 0000000..3c37dfb
Binary files /dev/null and b/android-kiosk-edid.bin differ
diff --git a/configuration.nix b/configuration.nix
index e51b742..6838a40 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -1,7 +1,15 @@
-{ pkgs, radiantwave, upgradeFlakeRef, radiantwavePlymouth, ... }:
+{ config, pkgs, radiantwave, upgradeFlakeRef, radiantwavePlymouth, ... }:
 
 let
   radiantApp = radiantwave.packages.${pkgs.system}.default;
+  # When the live-updater module is enabled, RadiantWave launches through the
+  # mutable /var/lib/radiantwave/current
+  # pointer so it can be swapped without a full nixos-rebuild. Otherwise it
+  # launches straight from the immutable system closure as before.
+  launchBin =
+    if config.services.radiantwaveUpdater.enable or false
+    then "/var/lib/radiantwave/current/bin/radiantwave"
+    else "/run/current-system/sw/bin/radiantwave";
   myKey = [ "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIL4qWNZnYU5JaqR9c2qh6oFZktzVNBOx42PfDaGofCL6 cnclack@pm.me macbook" ];
 in
 {
@@ -159,7 +167,7 @@ in
       # Release the splash screen right before the compositor takes over the display
       sudo -n plymouth quit --wait || true
 
-      exec dbus-run-session cage -- /run/current-system/sw/bin/radiantwave -d -s > /tmp/kiosk.log 2>&1
+      exec dbus-run-session cage -- ${launchBin} -d -s > /tmp/kiosk.log 2>&1
     fi
   '';
 
@@ -255,32 +263,4 @@ in
       echo "Backup completed at $(date)" > "$BACKUP_DIR/.backup-timestamp"
     '';
   };
-
-  # --- Health check service: runs after nixos-upgrade ---
-  # systemd.services.radiantwave-healthcheck = {
-  #   description = "Verify RadiantWave is running after upgrade, rollback if not";
-  #   after = [ "nixos-upgrade.service" ];
-  #   wantedBy = [ "nixos-upgrade.service" ];
-  #   serviceConfig = {
-  #     Type = "oneshot";
-  #     # Give cage time to start radiantwave after the switch
-  #     ExecStartPre = "${pkgs.coreutils}/bin/sleep 90";
-  #   };
-  #   script = ''
-  #     # The installed `radiantwave` is a makeWrapper script that execs the real
-  #     # binary (`.radiantwave-unwrapped`), so the process comm is not exactly
-  #     # `radiantwave`; match the exec'd binary's command line instead.
-  #     if ${pkgs.procps}/bin/pgrep -f '\.radiantwave-unwrapped' > /dev/null; then
-  #       echo "RadiantWave is running, upgrade successful"
-  #       exit 0
-  #     fi
-
-  #     echo "RadiantWave not found after upgrade, rolling back..."
-
-  #     # Roll back to previous NixOS generation
-  #     /run/current-system/sw/bin/nixos-rebuild switch --rollback
-
-  #     echo "Rollback completed at $(date)"
-  #   '';
-  # };
 }
diff --git a/edid-override.nix b/edid-override.nix
new file mode 100644
index 0000000..10be3e6
--- /dev/null
+++ b/edid-override.nix
@@ -0,0 +1,74 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.kioskEdid;
+
+  overrideModule = types.submodule {
+    options = {
+      connector = mkOption {
+        type = types.str;
+        example = "HDMI-A-1";
+        description = ''
+          DRM connector name to apply the EDID override to.
+          Check `ls /sys/class/drm/` on target hardware to confirm the
+          exact name (e.g. HDMI-A-1, HDMI-A-2).
+        '';
+      };
+
+      edidFile = mkOption {
+        type = types.path;
+        description = ''
+          Path to the binary EDID file to force for this connector.
+        '';
+      };
+
+      forceConnected = mkOption {
+        type = types.bool;
+        default = true;
+        description = ''
+          Also force this connector to be treated as connected
+          (video=<connector>:e), in case the real link reports
+          disconnected/garbled state through a splitter or wireless kit.
+        '';
+      };
+    };
+  };
+in
+{
+  options.services.kioskEdid = {
+    enable = mkEnableOption "forcing custom EDIDs on one or more display connectors";
+
+    overrides = mkOption {
+      type = types.listOf overrideModule;
+      default = [ ];
+      description = ''
+        List of per-connector EDID overrides to apply. Each entry gets its
+        own firmware file and its own drm.edid_firmware kernel param.
+      '';
+      example = literalExpression ''
+        [
+          { connector = "HDMI-A-1"; edidFile = ./android-4k30-edid.bin; }
+          { connector = "HDMI-A-2"; edidFile = ./android-4k30-edid.bin; }
+        ]
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    hardware.firmware = map
+      (o: pkgs.runCommand "kiosk-edid-firmware-${o.connector}" { } ''
+        mkdir -p $out/lib/firmware/edid
+        cp ${o.edidFile} $out/lib/firmware/edid/${o.connector}.bin
+      '')
+      cfg.overrides;
+
+    boot.kernelParams = flatten (map
+      (o:
+        [ "drm.edid_firmware=${o.connector}:edid/${o.connector}.bin" ]
+        ++ optional o.forceConnected "video=${o.connector}:e"
+      )
+      cfg.overrides);
+  };
+}
diff --git a/flake.lock b/flake.lock
index 8532e96..8cbaeca 100644
--- a/flake.lock
+++ b/flake.lock
@@ -240,11 +240,11 @@
         "nixpkgs": "nixpkgs_4"
       },
       "locked": {
-        "lastModified": 1787673353,
-        "narHash": "sha256-aLWuba8+AVfYQc3GNBSb74d/p7F28K8yI2MUMZKq89k=",
+        "lastModified": 1787943320,
+        "narHash": "sha256-zoHqtwO0DV3z/N311IxiMLrbyQHrw7HIoL1FQW5pGDk=",
         "ref": "dev",
-        "rev": "400c6a782be0cda69fc41b47783693536e7265a3",
-        "revCount": 45,
+        "rev": "2917d33866f052eca1e9daea175d95382a9087f2",
+        "revCount": 50,
         "type": "git",
         "url": "https://gitea.radiantwavetech.com/RadiantWaveTech/radiantwave.git"
       },
diff --git a/flake.nix b/flake.nix
index 8d082ab..cbddecc 100644
--- a/flake.nix
+++ b/flake.nix
@@ -55,6 +55,38 @@
 
       revision = self.rev or self.dirtyRev or null;
 
+      # DEV/PROD CHANNEL SELECTOR — the single block that differs between the
+      # `main` and `dev` branches. Everything downstream (the four configs, the
+      # ISOs, the updater module) is identical on both branches and pulls from
+      # this channel, so a `dev`-to-`main` merge carries your changes with it
+      # automatically. There are no more `-dev` sibling configs to copy.
+      #
+      #   main: appInput = radiantwave (main), atticRepo = "radiantwave",
+      #         gitRef = "" (default branch)
+      #   dev:  appInput = radiantwave-dev,   atticRepo = "radiantwave-dev",
+      #         gitRef = "?ref=dev"
+      #
+      # To flip branches, change ONLY these three values (then push/merge).
+      channel = {
+        appInput = radiantwave-dev;                                    # dev
+        atticRepo = "radiantwave-dev";                                 # dev
+        gitRef = "?ref=dev";                                           # dev
+      };
+
+      # Live app-update side channel. The manifest is served by the
+      # fileserver; closures are fetched (never built) from the channel's
+      # Attic cache. `repo` selects the channel — "radiantwave" (main) or
+      # "radiantwave-dev" (dev). All variants follow this same update
+      # procedure; only the channel differs.
+      radiantwaveUpdaterModule = { repo, baseline }: {
+        services.radiantwaveUpdater = {
+          enable = true;
+          baselinePackage = baseline;
+          manifestUrl = "https://files.radiantwavetech.com/${repo}/manifest.json";
+          atticUrl = "https://attic.radiantwavetech.com/${repo}";
+        };
+      };
+
       mkKioskSystem = {
         system,
         radiantwave,
@@ -79,6 +111,7 @@
               system.configurationRevision = revision;
             }
             ./configuration.nix
+            ./radiantwave-updater.nix
             disko.nixosModules.disko
             diskModule
             nixos-facter-modules.nixosModules.facter
@@ -116,6 +149,7 @@
               ];
             })
             ./configuration.nix
+            ./radiantwave-updater.nix
             radiantwave.nixosModules.default
             {
               networking.hostName = hostName;
@@ -167,81 +201,69 @@
     in
     {
       packages.x86_64-linux.radiantwavekiosk = self.nixosConfigurations.radiantwavekiosk.config.system.build.toplevel;
-      packages.x86_64-linux.radiantwavekiosk-dev = self.nixosConfigurations.radiantwavekiosk-dev.config.system.build.toplevel;
       packages.x86_64-linux.radiantwavekiosk-commercial = self.nixosConfigurations.radiantwavekiosk-commercial.config.system.build.toplevel;
-      packages.x86_64-linux.radiantwavekiosk-commercial-dev = self.nixosConfigurations.radiantwavekiosk-commercial-dev.config.system.build.toplevel;
       packages.x86_64-linux.radiantwavekiosk-android = self.nixosConfigurations.radiantwavekiosk-android.config.system.build.toplevel;
-      packages.x86_64-linux.radiantwavekiosk-android-dev = self.nixosConfigurations.radiantwavekiosk-android-dev.config.system.build.toplevel;
       packages.x86_64-linux.radiantwavekiosk-rpi = self.nixosConfigurations.radiantwavekiosk-rpi.config.system.build.toplevel;
-      packages.x86_64-linux.radiantwavekiosk-rpi-dev = self.nixosConfigurations.radiantwavekiosk-rpi-dev.config.system.build.toplevel;
 
-      # Kiosk systems.
+      # Kiosk systems — one per hardware target, no dev/prod siblings.
       #
-      # Production variants consume the `radiantwave` input (?ref=main);
-      # `-dev` variants consume `radiantwave-dev` (?ref=dev) and track the
-      # dev branch of this repo via their autoUpgrade flake refs.
+      # Every config consumes the channel selected at the top of this file
+      # (see `channel`): the RadiantWave app input, the Attic repo/manifest
+      # it fetches live updates from, and the KioskConfig git ref it
+      # auto-upgrades from. On `main` the channel is prod; on `dev` it is the
+      # dev channel. Because there is exactly one config per hardware type,
+      # changes made on `dev` reach prod via a plain merge — no copying.
       nixosConfigurations = {
         radiantwavekiosk = mkKioskSystem {
           system = "x86_64-linux";
-          radiantwave = radiantwave;
+          radiantwave = channel.appInput;
           hostName = "radiantwavekiosk";
           diskModule = ./disk-config.nix;
-          upgradeFlakeRef = "git+https://gitea.radiantwavetech.com/RadiantWaveTech/KioskConfig.git#radiantwavekiosk";
-        };
-        radiantwavekiosk-dev = mkKioskSystem {
-          system = "x86_64-linux";
-          radiantwave = radiantwave-dev;
-          hostName = "radiantwavekiosk-dev";
-          diskModule = ./disk-config.nix;
-          upgradeFlakeRef = "git+https://gitea.radiantwavetech.com/RadiantWaveTech/KioskConfig.git?ref=dev#radiantwavekiosk-dev";
+          upgradeFlakeRef = "git+https://gitea.radiantwavetech.com/RadiantWaveTech/KioskConfig.git${channel.gitRef}#radiantwavekiosk";
+          extraModules = [
+            (radiantwaveUpdaterModule { repo = channel.atticRepo; baseline = channel.appInput.packages.x86_64-linux.default; })
+          ];
         };
         radiantwavekiosk-commercial = mkKioskSystem {
           system = "x86_64-linux";
-          radiantwave = radiantwave;
+          radiantwave = channel.appInput;
           hostName = "radiantwavekiosk-commercial";
           diskModule = ./commercial-disk-config.nix;
-          upgradeFlakeRef = "git+https://gitea.radiantwavetech.com/RadiantWaveTech/KioskConfig.git#radiantwavekiosk-commercial";
-        };
-        radiantwavekiosk-commercial-dev = mkKioskSystem {
-          system = "x86_64-linux";
-          radiantwave = radiantwave-dev;
-          hostName = "radiantwavekiosk-commercial-dev";
-          diskModule = ./commercial-disk-config.nix;
-          upgradeFlakeRef = "git+https://gitea.radiantwavetech.com/RadiantWaveTech/KioskConfig.git?ref=dev#radiantwavekiosk-commercial-dev";
+          upgradeFlakeRef = "git+https://gitea.radiantwavetech.com/RadiantWaveTech/KioskConfig.git${channel.gitRef}#radiantwavekiosk-commercial";
+          extraModules = [
+            (radiantwaveUpdaterModule { repo = channel.atticRepo; baseline = channel.appInput.packages.x86_64-linux.default; })
+          ];
         };
         # Rotated screen for android-style displays.
         radiantwavekiosk-android = mkKioskSystem {
           system = "x86_64-linux";
-          radiantwave = radiantwave;
+          radiantwave = channel.appInput;
           hostName = "radiantwavekiosk-android";
           diskModule = ./disk-config.nix;
-          upgradeFlakeRef = "git+https://gitea.radiantwavetech.com/RadiantWaveTech/KioskConfig.git#radiantwavekiosk-android";
-          extraModules = [./rotated_display.nix];
-        };
-        radiantwavekiosk-android-dev = mkKioskSystem {
-          system = "x86_64-linux";
-          radiantwave = radiantwave-dev;
-          hostName = "radiantwavekiosk-android-dev";
-          diskModule = ./disk-config.nix;
-          upgradeFlakeRef = "git+https://gitea.radiantwavetech.com/RadiantWaveTech/KioskConfig.git?ref=dev#radiantwavekiosk-android-dev";
-          extraModules = [./rotated_display.nix];
+          upgradeFlakeRef = "git+https://gitea.radiantwavetech.com/RadiantWaveTech/KioskConfig.git${channel.gitRef}#radiantwavekiosk-android";
+          extraModules = [
+            ./rotated_display.nix
+            (radiantwaveUpdaterModule { repo = channel.atticRepo; baseline = channel.appInput.packages.x86_64-linux.default; })
+          ];
         };
         # Raspberry Pi 5.
         radiantwavekiosk-rpi = mkRpiKioskSystem {
-          radiantwave = radiantwave;
+          radiantwave = channel.appInput;
           hostName = "radiantwavekiosk-rpi";
-          upgradeFlakeRef = "git+https://gitea.radiantwavetech.com/RadiantWaveTech/KioskConfig.git#radiantwavekiosk-rpi";
-        };
-        radiantwavekiosk-rpi-dev = mkRpiKioskSystem {
-          radiantwave = radiantwave-dev;
-          hostName = "radiantwavekiosk-rpi-dev";
-          upgradeFlakeRef = "git+https://gitea.radiantwavetech.com/RadiantWaveTech/KioskConfig.git?ref=dev#radiantwavekiosk-rpi-dev";
+          upgradeFlakeRef = "git+https://gitea.radiantwavetech.com/RadiantWaveTech/KioskConfig.git${channel.gitRef}#radiantwavekiosk-rpi";
+          extraModules = [
+            (radiantwaveUpdaterModule { repo = channel.atticRepo; baseline = channel.appInput.packages.aarch64-linux.default; })
+          ];
         };
 
         # === USB Images ===
         # Each ISO installs exactly the named system closure using that
         # system's disk layout. NVMe layouts pair with ./disk-config.nix,
         # SATA with ./commercial-disk-config.nix — don't cross them.
+        # The same names build dev-flavored images when the flake is checked
+        # out on the `dev` branch (the channel block above selects the dev
+        # app, attic repo, and upgrade ref), so there are no separate -dev
+        # ISOs.
         kiosk-iso = mkIso {
           targetConfig = "radiantwavekiosk";
           diskModule = ./disk-config.nix;
@@ -254,18 +276,6 @@
           targetConfig = "radiantwavekiosk-android";
           diskModule = ./disk-config.nix;
         };
-        dev-iso = mkIso {
-          targetConfig = "radiantwavekiosk-dev";
-          diskModule = ./disk-config.nix;
-        };
-        commercial-dev-iso = mkIso {
-          targetConfig = "radiantwavekiosk-commercial-dev";
-          diskModule = ./commercial-disk-config.nix;
-        };
-        android-dev-iso = mkIso {
-          targetConfig = "radiantwavekiosk-android-dev";
-          diskModule = ./disk-config.nix;
-        };
       };
     };
 }
diff --git a/force_4k30_portrait_only.py b/force_4k30_portrait_only.py
new file mode 100644
index 0000000..63c718a
--- /dev/null
+++ b/force_4k30_portrait_only.py
@@ -0,0 +1,128 @@
+#!/usr/bin/env python3
+"""
+Forces 2160x3840 portrait @ 30Hz as the ONLY Detailed Timing Descriptor
+(DTD slot 1 / preferred timing) and strips the Video Data Block from the
+CTA-861 extension so no other video mode is advertised in any way.
+
+Usage:
+  python3 force_4k30_portrait_only.py donor.bin fixed.bin
+"""
+
+import sys
+
+
+def build_dtd(pixel_clock_khz, h_active, h_blank, h_sync_offset, h_sync_width,
+              v_active, v_blank, v_sync_offset, v_sync_width,
+              h_size_mm=0, v_size_mm=0, h_border=0, v_border=0,
+              interlaced=False, hsync_pos=True, vsync_pos=True):
+    pc = round(pixel_clock_khz / 10)  # EDID stores pixel clock in 10kHz units
+    dtd = bytearray(18)
+    dtd[0] = pc & 0xFF
+    dtd[1] = (pc >> 8) & 0xFF
+
+    dtd[2] = h_active & 0xFF
+    dtd[3] = h_blank & 0xFF
+    dtd[4] = ((h_active >> 8) << 4) | (h_blank >> 8)
+
+    dtd[5] = v_active & 0xFF
+    dtd[6] = v_blank & 0xFF
+    dtd[7] = ((v_active >> 8) << 4) | (v_blank >> 8)
+
+    dtd[8] = h_sync_offset & 0xFF
+    dtd[9] = h_sync_width & 0xFF
+    dtd[10] = ((v_sync_offset & 0xF) << 4) | (v_sync_width & 0xF)
+    dtd[11] = (((h_sync_offset >> 8) & 0x3) << 6) | \
+              (((h_sync_width >> 8) & 0x3) << 4) | \
+              (((v_sync_offset >> 4) & 0x3) << 2) | \
+              ((v_sync_width >> 4) & 0x3)
+
+    dtd[12] = h_size_mm & 0xFF
+    dtd[13] = v_size_mm & 0xFF
+    dtd[14] = ((h_size_mm >> 8) << 4) | (v_size_mm >> 8)
+
+    dtd[15] = h_border
+    dtd[16] = v_border
+
+    flags = 0x18  # digital separate sync
+    if interlaced:
+        flags |= 0x80
+    if hsync_pos:
+        flags |= 0x02
+    if vsync_pos:
+        flags |= 0x04
+    dtd[17] = flags
+
+    return dtd
+
+
+TAG_VIDEO = 2
+
+
+def strip_video_data_block(ext):
+    """Remove all Video Data Blocks from a CTA-861 extension block."""
+    dtd_offset = ext[2]
+    pos = 4  # skip 4-byte CTA header
+    blocks = []
+    while pos < dtd_offset:
+        tag = (ext[pos] >> 5) & 0x07
+        length = ext[pos] & 0x1F
+        block_data = bytes(ext[pos + 1:pos + 1 + length])
+        blocks.append((tag, length, block_data))
+        pos += 1 + length
+
+    blocks = [(t, l, d) for t, l, d in blocks if t != TAG_VIDEO]
+
+    new_db = bytearray()
+    for tag, length, data in blocks:
+        new_db.append((tag << 5) | length)
+        new_db.extend(data)
+
+    new_ext = bytearray(128)
+    new_ext[0] = ext[0]  # CTA tag
+    new_ext[1] = ext[1]  # revision
+    new_ext[2] = 4 + len(new_db)  # new DTD offset
+    new_ext[3] = ext[3]  # flags (audio, YCbCr, etc.)
+    new_ext[4:4 + len(new_db)] = new_db
+
+    new_ext[0x7F] = 0
+    new_ext[0x7F] = (-sum(new_ext)) % 256
+    return new_ext
+
+
+if __name__ == "__main__":
+    infile, outfile = sys.argv[1], sys.argv[2]
+    data = bytearray(open(infile, "rb").read())
+
+    # --- 2160x3840 portrait @ 30Hz ---
+    # H blanking uses CVT-RB-style fixed values (front 48 / sync 32 / back 80)
+    # V blanking computed to satisfy CVT-RB min vertical blank time (~460us)
+    # Pixel clock ~= htotal * vtotal * refresh
+    dtd_4k30 = build_dtd(
+        pixel_clock_khz=271020,
+        h_active=2160, h_blank=160, h_sync_offset=48, h_sync_width=32,
+        v_active=3840, v_blank=54, v_sync_offset=3, v_sync_width=5,
+        h_size_mm=685, v_size_mm=1218,  # swapped panel physical size for portrait
+    )
+
+    # Slot 1 = bytes 54-71 (was 1920x1080@60, the preferred timing)
+    data[54:72] = dtd_4k30
+
+    # Slot 2 = bytes 72-89 (was 1280x720@60) - blank out to a dummy
+    # descriptor so no second timing is advertised at all.
+    # Dummy Descriptor format: 00 00 00 10 00, then 13 zero-padding bytes.
+    dummy = bytearray(18)
+    dummy[3] = 0x10  # tag byte for "Dummy Descriptor"
+    data[72:90] = dummy
+
+    # Unknown Display Descriptor slot and Product Name descriptor are
+    # left as-is.
+
+    # Recompute base block checksum (byte 127)
+    data[127] = (256 - sum(data[0:127]) % 256) % 256
+
+    # Strip Video Data Block from CTA-861 extension (bytes 128-255)
+    data[128:256] = strip_video_data_block(data[128:256])
+
+    open(outfile, "wb").write(data)
+    print(f"Wrote {outfile}")
+    print("Run `edid-decode` on the output to verify before flashing.")
diff --git a/radiantwave-updater.nix b/radiantwave-updater.nix
new file mode 100644
index 0000000..a020efb
--- /dev/null
+++ b/radiantwave-updater.nix
@@ -0,0 +1,98 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.services.radiantwaveUpdater;
+in
+{
+  options.services.radiantwaveUpdater = {
+    enable = lib.mkEnableOption "live RadiantWave app updates via a polled manifest";
+
+    manifestUrl = lib.mkOption {
+      type = lib.types.str;
+      description = "HTTP(S) URL of the JSON manifest announcing the current app store path.";
+    };
+
+    atticUrl = lib.mkOption {
+      type = lib.types.str;
+      description = "Attic cache URL to fetch the app closure from (fetch-only, never builds).";
+    };
+
+    baselinePackage = lib.mkOption {
+      type = lib.types.package;
+      description = "Copy of RadiantWave baked into the system closure, used to seed the runtime pointer before the first update.";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    # Runtime pointer the login shell launches RadiantWave from. Seeded on
+    # first boot to the baseline copy already baked into the system closure
+    # (so the ISO carries it with no duplication); the updater service later
+    # re-points it atomically to newer closures fetched from Attic.
+    systemd.tmpfiles.rules = [
+      "L /var/lib/radiantwave/current - - - - ${cfg.baselinePackage.outPath}"
+    ];
+
+    systemd.services.radiantwave-updater = {
+      description = "Poll the RadiantWave manifest and swap the live app pointer";
+      after = [ "network-online.target" ];
+      wants = [ "network-online.target" ];
+      serviceConfig = {
+        Type = "oneshot";
+        # NOTE: no RemainAfterExit here. Keeping the oneshot "active" after
+        # it finishes breaks the timer's OnUnitActiveSec re-arming, so the
+        # 2-min cadence stops after the first run (NEXT goes empty, Trigger
+        # becomes n/a). Let the service return to dead so the timer refires.
+      };
+      script = ''
+        set -u
+
+        NEW_PATH=$(${pkgs.curl}/bin/curl -fsSL "${cfg.manifestUrl}" \
+          | ${pkgs.jq}/bin/jq -er .storePath) || {
+          echo "radiantwave-updater: failed to fetch/parse manifest from ${cfg.manifestUrl}"
+          exit 0
+        }
+
+        CURRENT=$(${pkgs.coreutils}/bin/readlink /var/lib/radiantwave/current 2>/dev/null || true)
+
+        if [ -z "$NEW_PATH" ] || [ "$NEW_PATH" = "$CURRENT" ]; then
+          # Already current; make sure the running closure is GC-rooted.
+          ${pkgs.coreutils}/bin/ln -sfn "$CURRENT" /var/lib/radiantwave/.current-root 2>/dev/null || true
+          echo "radiantwave-updater: already current (''${CURRENT})"
+          exit 0
+        fi
+
+        # Realize the closure via the variant's Attic cache plus cache.nixos.org.
+        # nixpkgs deps (e.g. sqlite) are signed by cache.nixos.org and Attic
+        # intentionally skips them to avoid re-uploading the world, so fetch
+        # them from cache.nixos.org and the whole closure resolves without ever
+        # building from source. Trusted public keys come from the system config
+        # (both Attic repos are trusted in configuration.nix). --add-root pins
+        # the fetched closure so GC can't collect it while the swap below makes
+        # it live.
+        echo "radiantwave-updater: acquiring ''${NEW_PATH}"
+        ${pkgs.nix}/bin/nix-store -r "$NEW_PATH" \
+          --add-root /var/lib/radiantwave/.current-root \
+          --option extra-substituters "${cfg.atticUrl} https://cache.nixos.org" || {
+          echo "radiantwave-updater: nix copy failed for ''${NEW_PATH}"
+          exit 1
+        }
+
+        # Atomic swap: the app never observes a half-updated pointer.
+        ${pkgs.coreutils}/bin/ln -sfn "$NEW_PATH" /var/lib/radiantwave/current.tmp
+        ${pkgs.coreutils}/bin/mv -T /var/lib/radiantwave/current.tmp /var/lib/radiantwave/current
+        echo "radiantwave-updater: swapped ''${CURRENT} -> ''${NEW_PATH}"
+      '';
+    };
+
+    systemd.timers.radiantwave-updater = {
+      description = "Check for RadiantWave app updates";
+      wantedBy = [ "timers.target" ];
+      timerConfig = {
+        OnBootSec = "2min";
+        OnUnitActiveSec = "2min";
+        Persistent = true;
+        Unit = "radiantwave-updater.service";
+      };
+    };
+  };
+}
diff --git a/temp/computer-direct_to_kiosk.bin b/temp/computer-direct_to_kiosk.bin
new file mode 100644
index 0000000..3c37dfb
Binary files /dev/null and b/temp/computer-direct_to_kiosk.bin differ
diff --git a/temp/root/computer-direct_to_kiosk.bin b/temp/root/computer-direct_to_kiosk.bin
new file mode 100644
index 0000000..3c37dfb
Binary files /dev/null and b/temp/root/computer-direct_to_kiosk.bin differ
diff --git a/temp/root/computer-splitter-out1_hdmi_to_kiosk-out2_wireless__unstable.bin b/temp/root/computer-splitter-out1_hdmi_to_kiosk-out2_wireless__unstable.bin
new file mode 100644
index 0000000..e69de29
diff --git a/temp/root/computer-splitter-out1_wireless-out2_hdmi_to_kiosk__unstable.bin b/temp/root/computer-splitter-out1_wireless-out2_hdmi_to_kiosk__unstable.bin
new file mode 100644
index 0000000..1ca080f
Binary files /dev/null and b/temp/root/computer-splitter-out1_wireless-out2_hdmi_to_kiosk__unstable.bin differ
diff --git a/temp/root/computer-splitter_out_1-direct_to_kiosk.bin b/temp/root/computer-splitter_out_1-direct_to_kiosk.bin
new file mode 100644
index 0000000..a9d79a9
Binary files /dev/null and b/temp/root/computer-splitter_out_1-direct_to_kiosk.bin differ
diff --git a/temp/root/computer-splitter_out_1-wireless-kiosk.bin b/temp/root/computer-splitter_out_1-wireless-kiosk.bin
new file mode 100644
index 0000000..f9620e2
Binary files /dev/null and b/temp/root/computer-splitter_out_1-wireless-kiosk.bin differ
diff --git a/temp/root/computer-splitter_out_2-direct_to_kiosk.bin b/temp/root/computer-splitter_out_2-direct_to_kiosk.bin
new file mode 100644
index 0000000..a9d79a9
Binary files /dev/null and b/temp/root/computer-splitter_out_2-direct_to_kiosk.bin differ
diff --git a/temp/root/computer-splitter_out_2-wireless-kiosk.bin b/temp/root/computer-splitter_out_2-wireless-kiosk.bin
new file mode 100644
index 0000000..f9620e2
Binary files /dev/null and b/temp/root/computer-splitter_out_2-wireless-kiosk.bin differ
diff --git a/temp/root/computer-wireless.bin b/temp/root/computer-wireless.bin
new file mode 100644
index 0000000..e69de29
diff --git a/tools/find_systems.zsh b/tools/find_systems.zsh
index bc8fc9e..7e47578 100755
--- a/tools/find_systems.zsh
+++ b/tools/find_systems.zsh
@@ -9,7 +9,7 @@
 
 set -uo pipefail # no -e: we want to keep going past unreachable hosts
 
-SUBNET="${1:-192.168.4.0/24}"
+SUBNET="${1:-192.168.1.0/24}"
 SSH_USER="kiosk"
 SSH_OPTS=(-o BatchMode=yes -o ConnectTimeout=5 -o StrictHostKeyChecking=accept-new)