Initialize Nitrokey HSM Device Blocked

I am trying to re-initialize my HSM key, but it doesn’t work anymore.
Entering: sc-hsm-tool --initialize --so-pin 3537363231383830 --pin 648219
Using reader with a card: Nitrokey Nitrokey HSM (DENK01022960000 ) 00 00
sc_card_ctl(*, SC_CARDCTL_SC_HSM_INITIALIZE, *) failed with PIN code or key incorrect
Running: sc-hsm-tool:
Using reader with a card: Nitrokey Nitrokey HSM (DENK01022960000 ) 00 00
Version : 3.2
Config options :
User PIN reset with SO-PIN enabled
SO-PIN tries left : 7
User PIN tries left : 2

Question: What can I do to factory reset the key and using which command?
I don’t remember having changed any of the PIN. All commands came from OpenSC (https://github.com/OpenSC/OpenSC/wiki/SmartCardHSM#generate-key-pair).

Thank you

Hi!

Unfortunately Nitrokey HSM does not have factory-reset. Once the SO-PIN is lost, and all attempts are used up for User PIN as well, device becomes blocked and unusable.

From https://github.com/OpenSC/OpenSC/wiki/SmartCardHSM#using-pkcs11-tool:

The SO-PIN has a retry counter of 15 and can not be unblocked. Blocking the SO-PIN will prevent any further token initialization or PIN unblock.

Potentially, in case the SO PIN was ever changed, perhaps the format was wrong as in: Nitrokey HSM SO-PIN conversion.
Other problem with the PIN might be its invalid length, like here: Nitrokey HSM - keypairgen fails with 16-digit user PIN (edit: apparently only with OpenSC older than v0.16).

As a last resort, you can look at forum search - perhaps this would remind you anything: https://support.nitrokey.com/search?q=HSM%20PIN.

Also please make sure you are using the latest OpenSC package, which is 0.19.