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Hard reset your phone by holding the volume and the turn on and off key together that will turn off your phone after that hold the volume key and the turn off and on key and the key in the middle of the back and tabs key that will tell you more further instructions

Did you forget your Google account or Samsung account? Either way, you can reset the password to the account on a computer. Then make sure the phone is connect to wifi when you try to enter your new password.