1- Charge upto 70 percent to perform Hard Reset.
2- Switch off your mobile.
3- Press & Hold Power + Volume key until boot mode appears.
4- Press Volume Up key once to enter recovery mode.
5- Using Volume down key, select Wipe Data/Factory reset.
6- Press Power for OK.
7- Using Volume down key, select Yes-delete all user data.
8- Press Power for OK.
9- Wiping data starts.
10- Now, press Power key once to reboot system now.
11- Phone is free from pattern.