If you forget the administrator code or need to clear all settings, a physical reset is required. we_ig_smartcode_keypad_en.pdf
If the batteries died before you could change them, use a 9V battery against the external contact points at the bottom of the lock to provide emergency power. Zeus Z3 Digital Lock Manual
Take a photo of the back of your physical manual (where the QR code and serial number are) and store it in your cloud drive. If the lock fails completely, that serial number is the only way to get a warranty replacement from Zeus customer support. If you forget the administrator code or need
