Nitropad - no PIN left

Is there an alternative to Factory reset if you are locked out of the system? If I need to do Factory reset, is there any guidance for beginners, as the one https://www.nitrokey.com/documentation/nitropad-systemaktualisierung?

There will follow a explanation of the factory reset function. There is none yet, I am afraid.

If you are locked out of system you are probably referring to the operation system (OS). In this case a reinstallation of the OS is necessary, I am sorry. Afterwards you might have to go throught similar steps needed after a system update, but maybe you need to reconfigure the BIOS as well, if the OS was overwriting the /boot partition.