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Why can't the information between Xiaomi systems 5 and 6 be synchronized?

To realize the synchronization function of Xiaomi mobile phone, it is necessary to turn on the synchronization function in the settings of the mobile phone. The following is the specific opening method:

1, turn on the phone, and then enter the phone settings.

2. Then find the Xiaomi account in the mobile phone to enter.

3. After entering, enter the cloud service, and then open the SMS backup.

4. Go back to the settings, and then turn on the synchronization under WiFi in the settings.