I remember that I had issues with the extdata partition, if I am not wrong the folder with the user data is empty on my unit on the extdata partition. Resetting from testmode didn't do anything to remove the password. I have lost my usb drive and am not able to enter the testmode at the moment but will get a new one pretty soon, I will post here any updates on unlocking the unit.
Thanks you for your help I will join the groupchat!