After Upgrading to 4.3 stable, I get: "Prearm: Mount not healthy"

ArduCopter Copter 4.3
10

Change MNT1_TYPE,6 (Gremsy) to MNT1_TYPE,0 (none) or something else like 1 (servo) if you are going to set it up.

You should be able to stay with the latest stable firmware

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