There are 2 ways. First, you can use a 9 volt battery to charge up the door lock at the 9 volt contact point to power up the door lock. Then you can use your card, password or fingerprint to enter. Alternatively, if you are using a mortise type door lock, you can use the given mechanical keys to unlock the door lock
Firstly, the may occur when the fingerprint is positioned differently as compared to when you register it. For the fingerprint to be detected, the difference must not to when you register it. For the fingerprint to be detected, the difference must not exceed a certain tolerance. Please try again with different fingerprint positions.
Secondly, due to genetic differences lines so the system may have difficulty detecting the fingerprints. If that is the case, the person can the password or the emergency key to open the door.