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I heard Samsung S5 has finger print scanner to unlock screen. How reliable is this? If I perform a data wipe or factory reset via recovery will the finger print lock still works?

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The purpose of the lockscreen is to prevent someone from accessing your data, which would be erased by performing a factory reset. A fingerprint scanner is not more secure than a password, it's only more convenient. A few cases where it falls short as a password are:

  1. You leave your fingerprints everywhere

  2. Its easier to obtain your fingerprints by force, than a password

  3. Its harder to change your fingerprints than a password

And Fingerprint lock in Samsung Galaxy 5 easily defeated by whitehat hackers

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