SHP-A30
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      SHP-A30 How to delete all user PIN codes

      1. Door should be open and unlocked
      2. Remove the battery cover
      3. Press the [REG] button
      4. Enter the current master PIN code + [*] button
      5. Press [1] followed by [*]
      6. Press [2] followed by [*]
      7. Press [3] followed by [*]