My apm 2.8 quadcopter's channel not working except for throttle

I have made a apm 2.8 quadcopter and done all necessary things on mission planner , my motor layout is correct , calibration has been done (accel, campus, radio) but the issue is only two channels are working throttle channel and channel 6th which is connected to servo motor .No other channel is working i mean i cant move it forward , backwards , roll etc and its also not stable as soon as i push the throttle it fell off on a side … done every possible thing to make it fly … confused . Can anybody guide me ?

The APM Flight Controller is long obsolete. There are few around who can help with them. Suggest you replace it with a supported board.