SHP-DH538 - How to delete a user PIN code

1. Unlock and open the door
2. Take the battery cover off
3. Press the [REG] button to start registration : Ding Dong
4. Enter the master pin + *
5. Enter 1 + * : Ding Dong
6. Enter 2 + * : Ding Dong
7. Enter a user PIN code that needs to be deleted + *
8. Repeat with another user PIN code if deleting other user PIN codes OR press [REG] button to exit registration
9. If you want to delete all user PIN codes at once, press 3 + * at step 6.