Unfortunately, your best bet is to treat it as a bricked unit and go after it with the tiny little serial pads inside. I made a little pogo-pin fitting for min

Unfortunately, your best bet is to treat it as a bricked unit and go after it with the tiny little serial pads inside. I made a little pogo-pin fitting for mine so I can just pop the covers off and stick the rig down into it and send new firmware over serial.