Before you try the factory reset or hard reset on your device, make sure that you have backup your important files. Restoring the default settings or factory reset your device will delete all your existing files and will go back to its initial state.
>>> On your device touch on Home.
>>> Go to Menu, then Settings.
>>> Select on Backup and reset.
>>> Choose Factory data reset.
>>> Touch on Reset phone. If you also want to remove all data saved to an installed micro SD, just tick the Erase SD card check box before touching Reset phone.
>>> And lastly touch on Erase everything and just follow the prompt to complete the factory reset.
Follow the onscreen instructions to set up your phone again after the reset.
>>> Turn off your phone.
>>> Press and hold together Volume Up + Power button for a few seconds.
>>> Once Recovery menu appears on the screen, release the buttons.
>>> Select "wipe data/factory reset" by using Volume buttons, and Power button to confirm.
>>> Then choose "Yes -- delete all user data".
>>> Confirm operation "reboot system now".
The instruction provided is the general steps on how to Hard Reset and Factory Reset.If the instruction will not work, please make a comment and we will immediately find the correct procedure. Thanks.