SHP-A30 How to change the master pin code

1. Door should be open and unlocked
2. Remove the battery cover
3. Press the [REG] button
4. Enter the current default master PIN code (1234+[*] button)
5. Press [1] followed by [*]
6. Press [1] followed by [*]
7. Enter the new master PIN codefollowed by [*]. (4~12 digits)