Vivo s7t can't set the ringtone, which means the setting has been turned off. What should I do?

I'm sorry for the inconvenience. You can try the following methods to solve the problem: 1. You can go to phone settings-General-Restore factory settings-Restore all settings. You can press and hold the power button to restart the phone. 3. You can go to official website to download the firmware upgrade package recovery system. Address of firmware upgrade for each model:/service.html. Enter this link, click "Service"-search for your mobile phone model in the search box, then select the model, and click Resource Download-Firmware Upgrade to download the complete rom package.

This is a tutorial, you can have a look. Firmware upgrade description:/thread-1024055-1-1.htmlBefore firmware upgrade, it is recommended that you back up your mobile phone data to prevent data loss.