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Why does the Samsung Galaxy Note 4 no longer read my fingerprint?

i usually unlock my note 4 using my fingerprint scanner , but now after i attempted to do it 10 times it still didnt work , after that it keeps asking me for my password which i have seemed to have forgotten. i have tried taking the battery out and putting it back in but it still asks for the password and no longer my fingerprint.

Try to clean the fingerprint scanner, maybe it's just having a hard time reading your fingerprint.

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