Solution: Dell laptop cannot recognize fingerprint

It is common problem with DELL laptops. Here is the link https://www.dell.com/community/Latitude/Fingerprint-reader-unresponsive-on-7490/td-p/6084094/page/3
My solution is to remove all existing fingerprint. I used to think the more fingerprint I store, the easier it recognizes me. This only applies to your mobile phone, not Dell laptops. To make things better, only add one fingerprint, I added my right hand thumb only and try to add it multiple times until Dell tells you the finger has already enrolled.

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