Hello all,
I managed to recover full operation of the device. After booting via rpiboot the the PC still slowed down especially windows explorer. But I could open the terminal on windows and use the diskpart clean command. Then I was able to create a new partition via commandline. Then the PC became ...

was attempting to upgrade my RevPi Connect SE from the Bullseye image to the latest Bookworm image using rpi-boot. I followed all the steps from the forum posts, instructions and youtube video ncluding using the watchdog jumper to flash the new image. It flashed successfully.

After reboot I was not ...