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Hard reset from settings:
At very First Step, Switch off your cell phone.
Then navigate to Settings -> Backup & reset -> Factory Data Reset -> Reset Phone -> Erase everything.
Now accept all informations.
Hard Reset by hardware keys method:
Power off your device.
Press and hold simultaneously Power button + Volume Up for about few seconds, or until you see menu of your screen.
Now Follow the instructions on your screen, and confirm operations.