Dear Volla-Users,
recently I had trouble deactivating security mode. Repeated attemps of entering the password and variations thereof failed. In the end a blank password lead to success.
As was discussed in the German-Forum, Volla has changed the password requirments. In the past a minimum of four characters were needed, now it can be left blank. I must have accidently overwritten it via the checkbox when activating.
So if you have password troubles, before resetting your device, try a blank password, it may save the day.
This is the current situation with VollaOS 15, things may change in future.