1st method
- Press Home -> Menu and then select settings
- Scroll down and select SD Card & Phone Storage
- Go to Internal Phone Storage section and select Factory data reset
- Select Reset Phone
- Select Erase Everything to confirm
2nd method
- Power off the phone
- Press and hold Volume down (Blue) and press the Power on (Yellow)
- Wait the bootloader screen to appear and then release the two buttons
- With volume down (Blue) go to Factory Reset and select it with Power on (Yellow)
