Copter 3.5.1/ pixhawk 2.4.8 won't arm?

ArduCopter Copter 3.5
1

Hi, i just flashed copter 3.5.1 on a tricopter frame (titus 600) with pixhawkk PX4 2.4.8 ( from banggood). With the new firmware i can’t arm the motor. The yaw servo received informations and move to center ( 1500) .The LCD screen on board and mission planner via USB don’t give information on non arming reason. The pixhawk don’t emitted non arming sound.
I can test the motors and servos via mission planner test pannel and all 3 motors and yaw servo are working. I do not enable FENCE.
I am also unable to downgrade to copter 3.4.6 version ( mission planner do not recognize the pixhawk?? but i am able to connect it via mavlink)

Any idea to help me

Thank’s

2

This happened to me when I put the first 3.5 rc on. I had to redo the radio setup and calibration on my FCs and everything was fine.

Can’t say this is your issue for sure but it’s worth a check.

Also was having the mp not recognizing the pixhawk after latest MP upgrade. Make sure your com port and baud rate are selected for the FC.

3

Thank’s Lance for your help.
I finally was able to downgrade the PX4 via QGgroundcountrol. Then re-install copter 3.5.1. with MP. Use the wizard to re-calibrate the copter. Recalibrate radio on more time and …YES… able to arm. Perseverance pays :slight_smile:
Waiting now for good weather to test the copter in flight an test the autotune.