"I made several attempts to calibrate the compass and the error persisted. After reading in some forums the similar experience of a colleague, where he solved the problem by downgrading to the first firmware version for arduplane. I did the same and…"
"I'm with the same version of Fw and same problem as yours. Is there a solution? Any firmware that corrected this error?
I have this same Bad AHRS in plane 3.7.1 MP 1.3.43.
Done all the stuff suggested. Recalibrade, power down/up, etc. …"