Warning : After Hard Reset/ Factory Reset All Data Will Be Lost. So Don't Forget backup Your All Data.
1. Press Power Key To Turn Off Your Device First.
2. Now Press And Hold Volume Up + Power Key Until Show Logo On Screen.
3. When Show Recovery Menu Use Volume Down key To Chose "wipe data / factory reset" Press Power Key To Confirm.
4. Now select "Yes -- delete all user data" wait Few Second
5. After Finish This Processes Select This Option "reboot system now".
Done.