SHP-DH537 - How to delete all key tags 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. Enter the current Master PIN code followed by the star (*).
5. Press 2 followed by the star (*) to select Key Tag Management.
6. Press 3 followed by the star (*) to select All Deletion.