Iqooz5, why can't the sound of this stupid mobile phone be adjusted?

You can check the following operation methods:

1. Restart the phone or enter the Settings-System Upgrade interface to detect and update the system;

2. Try to adjust after canceling the phone case;

3. After backing up the data, go to Mobile Settings-System Management-Backup and Reset to restore all settings. This operation will not delete the data in the mobile phone, but will restore all the settings in the mobile phone, including the set wallpaper, unlocking method, WiFi, default opening program, etc. And the third-party software account registered in the mobile phone needs to log in again.

If the above methods are ineffective after operation, you can take the mobile phone and purchase certificate to the customer service center for testing and processing in time. The address of the customer service center is: enter the service outlet of vivo official website /vivo Mall APP-mine-or the webpage version of vivo official website-slide to the bottom-service support-service outlet query-select provinces and cities to query the address of the customer service center. It is recommended to call in advance before going to avoid empty running, plan your trip reasonably and travel safely.