Cannot Add Fingerprints or Fingerprint Does Not Work
Make sure the fingerprint is properly registered and recognizable.
Change the default Master PIN (12345678) before adding fingerprints.
Ensure the finger being registered is clean and dry.
Keep the fingerprint sensor clean and dry.
Register the same finger multiple times to improve recognition.
Try registering different fingers.
During enrollment, place your finger on the sensor from different angles.
Apply slightly more pressure during the 8-step scanning process.