Problem with mRo x2.1 simple or 777 version with DSMX receivers ( Spektrum SPM4649T or OrangeRx R111XN ) for very long time and still can`t use any of them, binding ok but channels not moving.
Checked all latest and older arducopter pilot rover firmwares, no lucky
SPM4649T looks like SRXL receiver, so powered from separate power pin 5V and anyway not working.
looks like same issue here 3.5-rc6 Pixracer DSM problem