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1st method
- Go to Settings -> Backup and Reset -> Factory Data Reset -> Reset Device -> Delete all
- Wait until tablet reboots
2nd method
- Power off the tablet
- Press and hold Volume Up (Yellow/It is the lower button) + Power on (Blue)
- When Android logo appears press the power on again (Blue)
- With Volume down button (Red) go to Wipe data / Factory Reset and press the Power on (Blue)
- With Volume down button go to YES — Delete all user data and press the Back key (Blue) to confirm