I’m sorry for my bad english.
I am a pixhawk 2 Cube Black user.
I did a software update but my hexacopter started to stray. I want to go back to version 3.5.0dev. Could you help?
This would be a mistake. Update to current Stable and work thru the issues you are having. 1st start with all of the mandatory calibrations.
You posted this is 4 different threads?
I am sorry I do not fully understand what you mean.
Could you talk a little more detail?
Update your Cube to current Stable version Arducopter (V4.0.3 today) and perform an accelerometer and compass calibration. Then follow this initial tuning process before 1st flight:
https://ardupilot.org/copter/docs/tuning-process-instructions.html
@dkemxr
I will do this on Monday. then I will get back to you again. I was just doing accelerometer calibration, gps calibration and radio control calibration. I have never done the parameter settings one by one, I will try again. hope it helps.
Post a link to a .bin flight log from the Flight Controller.