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.
>>> Press the Home key, and tap on the Application/Menu icon.
>>> Select Settings, then go to Privacy.
>>> Choose Factory data reset, then tap on Reset phone.
>>> To confirm the reset tap Erase everything.
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.