Upload creates crazy GPIO-values + constant reboots (builds fine)

Upload works after rebooting the board into bootloader mode.
The same output after debug without uploading.

I installed WinUSB on interface 2 in Zadoc to test. But after successfull installation Zadog still shows this (see “Driver:”):

and device manager shows no com 5:

Update:
I even de-installed the libusb-win32 device and installed WinUSB again on interface 2 using a different cable and port. After resetting and putting the S3 into bottloader mode: still the same in Zadic and in device manager…

I’m going to give this a try…