I replaced one of my quadcopter's ESC two days ago. But when I finished the work and rebooted the APM, it could not record the radio calibration. No matter how many times I recorded it, it still could not record the radio calibration.

Though the APM could not record the radio calibration, when I tried to do radio calibration, it worked and after I finished it, I could turn the quadcopter on. 

So, does anyone know what happen to my APM?
Does the problem be the ESC?
But I am sure I have finished the correction.(Maybe>.<?)
Or the APM is broken?
I replaced the ESC because of the old one was burnt out.





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