Hi Leo,   i had tried everything, also trying to load with old IOS, but no chance. Only thing that solved was RMA the switch with Cisco :-( .

I got exactly in the same issue after trying to upgrade from 15.2(4)E1 to 15.2(4)E6. It was 2 switches in the stack. Switch 1 was OK, but the switch 2 is stuck in this screen.   I attached the log.