[Donia Nikoo]

I always use my fingerprint as a password but for some reason that option has dissapeared and the only thing on the screen is the option to put it a password or emergency call. I don't remember my password and can't get in, i've tried restarting my phone, turning it on and off, and taking the battery out but its still like this.

[the tall guy]

Hi, have you tried using Android Device Manager?

[B. Diddy]

Welcome to Android Central! It's probably asking for your backup password, which you had to select when you first set up the fingerprint unlock. You don't remember that? It's an important thing to remember, since the fingerprint scanner can fail.