I have changed everything, boards, receivers, transmitters, but I still can’t get the flight modes to change. It’s just locked on flight mode 4. The radio calibration changes with the switch movements from a value ranging from: 969-1522-2076. I’m using the elevon config on plane selection. I have 2 quads running the ardu’s and don’t have any problems at all.
without a log it is hard to tell, but my guess is you have your flight mode channel on a different channel than the one set in the FLTMODE_CH parameter. The default for APM:Plane is channel 8, and for copters it is 5. Perhaps you have the mode switch attached to channel 5?
Cheers, Tridge