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1st method
- Go to Settings -> Privacy -> Factory Reset
- Select Reset Phone
- Select Erase Everything to confirm and wait to reboot
2nd method
- Power off the phone
- Press and hold Volume up (Red) and Power on (Yellow)
- When recovery screen appears release the buttons
- With Volume down (Blue) go to Factory Reset / Wipe Data and select it with Power on (Yellow)
- Use Volume down (Blue) again to go to YES and confirm it with Power on (Yellow)