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How to cancel the security warning of Xiaomi mobile phone

You can choose to back up important data (contacts, SMS, call history, applications) and then restore the factory settings. This method can solve most unknown problems, without any harm to the mobile phone, and can be operated with confidence. If it still doesn't work, I suggest you turn it off first, then press the volume button and the power button at the same time to enter the recovery mode, and choose to clear the data.