SHP-DH537 - How to delete user PIN codes at once

1. Unlock and open the door.
2. Open the battery cover, located in the interior part of the unit.
3. Press the Registration [REG] button once.
4. When the touchscreen is illuminated, enter the current Master PIN code and press the star (*).
5. Press 1 followed by the star (*) to select User Password Management.
6. Press 3 followed by the star (*) to select All Deletion.