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How to completely delete Redmi's personal information?

Your situation can be handled by double liquidation:

1 If the data has not been backed up before, this operation will clear the personal data.

2 Press and hold the volume button+power button to turn on the machine. There is an image of a robot, and press the Home button.

3 Select the factory settings for erasing data, and then press the menu button to restore the factory settings.

4 Then choose to restart the system immediately and press the menu button to restart.