Hi All, I am using APM1 with Xbee pro 900 stock. When I am updating params for Arducopter, I got failure and then it could not connect any more. The Mission Planner is 1.1.31. Is there any way to test this Xbee and detect what module is wrong? Both them still have power on. Thanks, Duy Ps: This is the screenshot of this error from Mission Planner