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Xiaomi 4 mobile phone keeps appearing Xiaomi trademark and simplified Chinese can't be turned on and off. What's the matter?
This is a sign that there is something wrong with the mobile phone system. The specific solutions are as follows:

1. Press and hold the power button, and then wait for the mobile phone to restart forcibly.

2. restart the phone, then select the phone WiFi and connect the WiFi.

3. Then select About Mobile Phone Entry, then select System Upgrade, and then download and complete the update.