How to solve calibration failed problem in mission planner

I use apm ardupilot flight controller and I faced calibration failed problem in mission planner. This is first calibration test.

You may have to use a version of Mission planner that is as old as that obsolete and no longer supported APM Flight Controller. Suggest you replace it.

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APM flight controller won’t support version 3.2.1 later. So I uploaded custom firmware (3.2.1)

Right, obsolete for years.

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The problem is not the ground control Station Software on your PC, so I changed the title.

The problem is the since eight years ago obsolete flight controller hardware.

To solve the problem:

  • either update the flight controller hardware,
  • or downgrade the ground control Station Software (mission planner) to a version from 2015.
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thanks I downgrade mission planner version and it worked