For a firmware reset, hold down the top two silver buttons of the digital back and insert battery. You will see the message "Repairing firmware, please wait..." but this is not a full reset and firmware should remain the same as before. Release the buttons after this message appears. The user interface should function normally at this time as buttons have been remapped. If not, please consult a Phase One partner for a potential repair.
For a UI reset, hold down all four silver hard buttons on the digital back and insert a battery. The same message "Repairing firmware, please wait..." appears and buttons can be released. Firmware will reset to factory defaults. Can be checked under the Menu>About section of the back. Should this process not work please consult a Phase One partner for a potential repair.