My BMV-712 PIN is still set to the factory default '000000' and I am trying to change it to my own PIN. I have unpaired all of my (Android) devices from the Victron controller. When I select PIN code reset in the app and enter the PUK code, I continuously get this message in the app. However, I never have the opportunity to set my desired PIN. When I click OK, the app takes me back to the Device List. What am I doing wrong?