Gimbal cannot receive Main controller data

[rolfs]

Hi, Mavic PRO. I replaced the esc board after a crash. Before that I was able to take off but immediately motor failure.
Now Gimbal seems to have no contact with main controller, and it is not possible to connect RC, connects for ever.
Power on looks good, gimbals does its initial moves, camera is working. Motors exercises.
Upgrading does not work.
Any idea is appreciated.