It explains step by step how to factory reset the Samsung A51. Master resetting your smartphone will result in the deletion of all the personal data stored on your phone's internal memory and it will return the smartphone's settings to factory values. Caution:you must have your gmail id which you used in device in case of Frp lock factory reset protection. Hard reset Method: 1.Firstly, turn off the device with Vol Down and Power. and plug USB Cable 2.In the next step press and hold together: Volume Up + Power button for a couple of seconds.HardReset Samsung A51 3.Release held keys when the Samsung Logo appears on the screen. 4.After that select from Recovery Mode menu "wipe data / factory reset" using Volume buttons to navigate and Power button to confirm. Remove screen password Samsung A51 5.Choose "Yes -- delete all user data" to confirm the whole operation.Wipe data Samsung A51 6.Then select option "reboot system now".Master Reset Samsung A51 7.Well done! The hard reset has just been performed.