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Compared with mechanical lock and card lock, fingerprint lock has many advantages, especially in security. However, even fingerprint lock with many advantages will have some awkward problems, such as fingerprint can not be identified, so why fingerprint can not be identified? In these cases, fingerp...

If you have a fingerprint lock in your home, sometimes you may encounter the problem that fingerprints can't be identified. At this time, it may be a black question mark expression package. Then you begin to wonder if you have got a false fingerprint, which is not because your fingerprints are false...