diff --git a/scripts/ambed.service b/scripts/ambed.service
index 1fc2127..ae75721 100644
--- a/scripts/ambed.service
+++ b/scripts/ambed.service
@@ -6,6 +6,9 @@ After=network.target
 Type=simple
 User=root
 Group=root
+ExecStartPre=-/sbin/rmmod ftdi_sio
+ExecStartPre=-/sbin/rmmod usb_serial
+# Note: adjust /xlxd/ if ambed is installed elsewhere
 ExecStart=/xlxd/ambed 127.0.0.1
 Restart=on-abnormal