diff --git a/scripts/dev-start.sh b/scripts/dev-start.sh
index 31459e15..b1e2b41e 100755
--- a/scripts/dev-start.sh
+++ b/scripts/dev-start.sh
@@ -39,6 +39,7 @@ fi
 echo ""
 echo "Archipelago Dev Server"
 echo ""
+echo "  0) Boot branding dev (GRUB theme, Plymouth, installer — patch + QEMU)"
 echo "  1) Mock backend (UI dev — fastest, no Docker/Podman needed)"
 echo "  2) Full stack (Rust backend + frontend)"
 echo "  3) Setup mode (first-time password setup — mock)"
@@ -48,9 +49,53 @@ echo "  6) Boot mode (simulated 25s startup — mock)"
 echo "  7) Testnet stack (signet Bitcoin + LND + ThunderHub via Podman)"
 echo "  8) Manual instructions"
 echo ""
-read -p "Enter choice [1-8]: " choice
+read -p "Enter choice [0-8]: " choice
 
 case $choice in
+    0)
+        echo ""
+        echo "Boot Branding Dev"
+        echo ""
+        # Find an ISO to patch
+        ISO=$(ls -t ~/Desktop/archipelago-dev-*.iso 2>/dev/null | head -1)
+        if [ -z "$ISO" ]; then
+            ISO=$(ls -t "$PROJECT_ROOT/image-recipe/results/archipelago-"*.iso 2>/dev/null | head -1)
+        fi
+
+        DEV_BRANDING="$PROJECT_ROOT/image-recipe/dev-branding.sh"
+
+        if [ -z "$ISO" ] || [ ! -f "$ISO" ]; then
+            echo "  No ISO found to patch. Options:"
+            echo ""
+            echo "  a) Preview GRUB background only (instant):"
+            echo "     python3 image-recipe/branding/generate-grub-background.py /tmp/grub-bg.png && open /tmp/grub-bg.png"
+            echo ""
+            echo "  b) Download an ISO from FileBrowser (http://192.168.1.228:8083)"
+            echo "     then drop it on your Desktop and re-run this option."
+            echo ""
+            echo "  Files you can edit:"
+            echo "    image-recipe/branding/grub-theme/background.png  — GRUB boot background"
+            echo "    image-recipe/branding/grub-theme/theme.txt       — GRUB menu colors/layout"
+            echo "    image-recipe/branding/plymouth-theme/logo.png    — Plymouth boot logo"
+            echo "    image-recipe/branding/plymouth-theme/*.script    — Plymouth animation"
+            echo ""
+            exit 0
+        fi
+
+        echo "  ISO: $ISO"
+        echo "  Edit these files, then this script patches and boots in QEMU:"
+        echo "    branding/grub-theme/background.png  — GRUB background"
+        echo "    branding/grub-theme/theme.txt       — GRUB menu theme"
+        echo "    branding/plymouth-theme/logo.png    — Plymouth logo"
+        echo ""
+
+        if [ -f "$DEV_BRANDING" ]; then
+            exec bash "$DEV_BRANDING" "$ISO"
+        else
+            echo "  dev-branding.sh not found at: $DEV_BRANDING"
+            exit 1
+        fi
+        ;;
     1)
         echo ""
         echo "Starting frontend with mock backend..."