"Ok thank you for all the hints, i solved the problem by running all configuration steps again.
I found two problems: the esc are not calibrated in the same way one of them was wrong.
second - the controler calibration was not working, don't know…"
Hi, My problem is that i can not arm my copter when everything is connected with the apm board. It seems that the actions from the radio controller are not recognized from the board. (or some arm checks fails - but i'm actually not able to figure…