APM 2.8 and mission planner

Hello there,
I am building my first drone using an apm fc version 2.8 and i have succesfully uploaded a firmware through the mission planner software. I have also calibrated my radio and compass but i get stuck at the sensors calibration. When i start the accelerometer calibration it asks me to put the drone in level position and click done and when i do so the software seems to freeze for a few seconds and then it gives me a message that calibration FAILED. Anyone run to this issue before? Is there anything i can try to resolve it ? Can it be a hardware failure? Is there any kind of logger or smth like a logger that records all the background actions that get done during calibration that i can check to find out what goes wrong?

I think you will need to use a very old MissionPlanner version from when that prehistoric hardware was supported.
The best idea is buy a supported flight controller before you waste too much more time.

It should be illegal for all those cheap chinese online shops to keep selling those APM units, but I guess someone made millions of those APMs for almost nothing, so every unit sold is non-refundable profit.

Any recomendations on flight controllers that are newer and compatible with mission planner?

https://ardupilot.org/copter/docs/common-autopilots.html