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1st method
- Go to menu or to notification
- Click settings
- Select Backup and reset -> Select Factory Reset -> Confirm
- Select Reset Phone -> Erase everything -> Confirm
2nd method
- Power off the phone
- Press and hold Volume up (Red) + Power On (Yellow)
- With Volume down (Blue) go to wipe data and select it with Power on (Yellow)
- With Volume down (Blue) go to Yes and select it with Power on (Yellow)
- Select Reboot phone now with Power on (Yellow)