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How to solve the problem that the voice of Huawei mate20 suddenly rings at the same time?

At the same time, the voice of Huawei mate20 suddenly sounded. Solution: Turn off the dual channel or mobile phone, or debug in the settings. The method is as follows:

1, enter Settings, and after unlocking the phone, find the "Settings" icon of the phone; 2. Slide the phone up to find the smart assistant; 4. Click "Smart Assistant" to find "Auxiliary Functions" in the interface; 5. Open "Accessibility" and find "Mono Audio" in the interface.