HI,
My new Mavic, my first day flying. I've tried a RTH and worked fine.
After that a signal of lack of compass calibration. I've tried all possibilites of calibration several times. The problem remains.

I also downgraded the firmware. no solutions
I upgraded firmware agains and the problem persists.
The menu  of sensors says compass 2 disconnected. Any idea how to solve?
Thanks

The menu  of sensors says compass 2 disconnected. Any idea how to solve?

If it says the sensor is disconnected I suspect you've got a defective Mavic and will need to exchange it.