• Switch off the mobile.
• Press and hold Volume up + Menu + power key together to begin the process.
• As soon the Android logo appear release all the key you hold.
• Through volume down key, Select the option Wipe data and to proceed press Power key.
• Now select Yes- delete all user data through volume down key and to proceed press Power key.
• Now the data starts formatting or wiping.
• After the process complete, Select Reboot system now to complete the process.
• Phone has been free from pattern lock.