I clearly set the SMS ringtone in the SMS bar, but I still came to SMS to inform the ringtone. What happened?

First, check whether you shut down the original software of the system by force. If yes, continue to use them all. Then restart the machine, set the bell, set the default sound in it and try again. Rebooting once or twice will definitely help.

That's what I did. I tried everything. I went to "restore factory settings" and added the downloaded ringtone to the "alarm clock" or "notice" in the folder. Finally, restart it. After a while, there seemed to be a response, and the next day I restored the ringtone I set.

I can't say why. I tried my best to set all the settings in my mobile phone. As long as all the settings related to information and sound are restored to the default settings, you will succeed in the end ~

I understand your anxiety very much, and I hope it will get better as my mobile phone ~