update install, add led script

install.sh

@@ -0,0 +1,53 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+FIRMWARE_SRC="$SCRIPT_DIR/firmware"
+BOOT="/boot/firmware"
+
+if [[ $EUID -ne 0 ]]; then
+    echo "ERROR: this script must be run as root (use sudo)" >&2
+    exit 1
+fi
+
+echo "=== IOT-GATE-RPI4 layer install ==="
+echo "Source : $FIRMWARE_SRC"
+echo "Target : $BOOT"
+echo
+
+# --- config.txt ---
+echo "[1/2] Installing config.txt"
+
+if [[ -f "$BOOT/config.txt" ]]; then
+    echo "  Backing up $BOOT/config.txt -> $BOOT/config.bak"
+    cp -v "$BOOT/config.txt" "$BOOT/config.bak"
+else
+    echo "  WARNING: $BOOT/config.txt not found, skipping backup"
+fi
+
+echo "  Copying $FIRMWARE_SRC/config.txt -> $BOOT/config.txt"
+cp -v "$FIRMWARE_SRC/config.txt" "$BOOT/config.txt"
+
+# --- overlays ---
+echo
+echo "[2/2] Installing device tree overlays"
+
+OVERLAY_SRC="$FIRMWARE_SRC/overlays/iotg-rpi4"
+OVERLAY_DST="$BOOT/overlays/iotg-rpi4"
+
+if [[ ! -d "$OVERLAY_SRC" ]]; then
+    echo "  ERROR: overlay source directory not found: $OVERLAY_SRC" >&2
+    exit 1
+fi
+
+echo "  Creating $OVERLAY_DST"
+mkdir -p "$OVERLAY_DST"
+
+for f in "$OVERLAY_SRC"/*; do
+    echo "  Copying $(basename "$f")"
+    cp -v "$f" "$OVERLAY_DST/"
+done
+
+echo
+echo "=== Done ==="
+echo "Reboot for overlay changes to take effect."