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Fingerprint machine after power has been repeatedly displays "Please press the (left) finger?"

 Possible reason is that
1. use for a long time, collecting the first surface becomes dirty or scratched, will collect the first mistaken fingerprint surface, but not through;
2. fingerprint head off loose connection or out;
3. Motherboard chip bad.

Remedy:
1 collected using self-adhesive cloth pasted the first surface of the dirt.
2.3 The two key questions you need to contact the vendor to apply for the warranty.




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