from Kunbus and now I cant login via SSH. I used the username "pi" and pass from the side of the RPi, but it doesnt work. (Yes I know its EN keyboard and have tried y<->z switch).
Hello! There is indeed a default password for the very first login after flashing. It's "raspberry" for bookworm and earlier, and will be "revolutionpi" for trixie and later.
Do also keep in mind that entering a password wrong 3 times will lock the account for 10 minutes, requiring you to either wait the 10 minutes or reboot the device to try logging in again. A short mention of this can be found in the documentation here under the package name "revpi-pam-faillock": https://revolutionpi.com/en/docs/revpi-images#bookworm