I have received my 2 pixhawks :-)
The first one is working fine, i have upgraded to 3.1.1 without any problem.
But the second one has issues to boot :-( i did the same procedure as on the first one but after the upgrade i get startup tone disturbed by beep beep and no connection via MP... still i'm able to upload new firmware but with the same results.
tried to upload plan/rover and press Button for IO upgrade but no success.
please help me