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.
Factory Reset:
1.Slide the Notifications panel open, and then tap Settings.
2.Select Backup and reset.
3. Tap Reset phone.
4.If you want to delete all your files, then tap Erase all data.
5.Then tap OK to confirm.
Hard Reset:
Use these steps when your phone is unresponsive or frozen and there's no way to access the settings on your phone.
1.Press and hold the Volume Down button, and then do the same way on the Power button.
2.Hold the two buttons until the three Android images appear on the screen.
3.Release the button when the three Android images appear and press Volume Down.
4.Tap on Factory Reset, and then press the Power Button to confirm.
