tools: add download_firmware script

Signed-off-by: Joshua Jun <joshuajun@proton.me>

Author: jplexer

tools/download_firmware.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+# SPDX-FileCopyrightText: 2026 Core Devices LLC
+# SPDX-License-Identifier: Apache-2.0
+
+import sys
+import urllib.request
+
+if len(sys.argv) < 3:
+    print("Usage: download_firmware.py <board> <version> [slot]")
+    print("Example: download_firmware.py asterix 4.9.121")
+    print("Example: download_firmware.py getafix_dvt 4.9.121 0")
+    sys.exit(1)
+
+board = sys.argv[1]
+version = sys.argv[2]
+slot = sys.argv[3] if len(sys.argv) > 3 else None
+
+# Build filename and URL
+if slot:
+    filename = f"firmware_{board}_v{version}_slot{slot}.elf"
+else:
+    filename = f"firmware_{board}_v{version}.elf"
+
+url = f"https://github.com/coredevices/PebbleOS/releases/download/v{version}/{filename}"
+
+print(f"Downloading {filename}...")
+urllib.request.urlretrieve(url, filename)
+print(f"Saved to {filename}")