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1st method
- Go to Settings -> Privacy -> Factory data reset -> Erase everything
- Insert phone lock code or pattern for verification
2nd method
- Go to dial pad and click *2767*3855#
3rd method
- While holding Volume up (Yellow) + Home Button (Red) press power on (Blue) to power on the phone
- Release power on and keep pressing the other two buttons
- With volume up/down go to Wipe data/Factory reset and confirm with the power on
- With volume up/down go to Yes and confirm with the power
- Go back to Reboot device and confirm with the power