Why does Meizu's SMS prompt sound even drip when it is muted?

I suggest you brush the latest stable firmware first to see if it can be solved. You can clear the data when you brush. You can search and download the corresponding firmware at the following website,/firmware.jsp. Among them, the stable firmware has fewer bugs, runs stably, and the latest experience firmware has more functions. Please download as needed. After the firmware is downloaded, update it as follows. 1) Copy the firmware to the root directory of the memory card->; Shut down-> Press the power button and volume button at the same time to enter the system upgrade mode; 2) Check System Update (if you need to clear data, check Clear Data at the same time), and click Start System Upgrade; 3) When upgrading the system, please don't turn it off; 4) After the system upgrade is completed, the mobile phone will start automatically; 5) Enter the system settings-> For mobile phones, please check the software version. If it is the selected version, the firmware upgrade is successful.