diff --git a/tools/send_fw.py b/tools/send_fw.py
index df411e6..bffd6e8 100644
--- a/tools/send_fw.py
+++ b/tools/send_fw.py
@@ -70,9 +70,11 @@ def receive_ack(serial):
     return ack
 
 FILENAME = 'firmware.bin'
+ID = 0
 if len(sys.argv) > 1:
     FILENAME = sys.argv[1]
-
+if len(sys.argv) > 2:
+    ID = int(sys.argv[2])
 
 if __name__ == "__main__":
 
@@ -97,7 +99,7 @@ if __name__ == "__main__":
     start.name = FILENAME
     start.size = size
     start.packages = len(packages)
-    start.device_id = 1
+    start.device_id = ID
     start.crc_fw = crc
 
     # Send the FirmwareStart message