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1st method
- Enter *2767*3855#
- Wait until phone reboots
2nd method
- Go to Settings -> Backup and Reset -> Factory Data Reset -> Reset Device -> Delete all
- Wait until phone reboots
3rd method
- Power off the phone
- Press and hold Volume Up (Red) + Home Button (Green) + Power on (Yellow) or Volume up (Red) + Menu (White) + Power on (Yellow)
- With Volume down (Blue) go to Wipe data / Factory Reset and press the Power button (Yellow)
- Use Volume down (Blue) again to go to Yes and confirm with (Yellow)
- Go to Reboot system now and press Power button (Yellow)
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