What is the principle of urgent message black screen?

... the mobile phone of MTK solution will receive this information, which will lead to such a problem!

To talk about the principle, we can only say that the mobile phone of MTK solution has a vibration interface for sound files, that is to say, when you put the vibration command into the ringtone, the mobile phone will automatically vibrate when you use the ringtone!

According to the vibration principle, in the MTK solution, besides the vibration interface, there may be a command interface with a black screen (of course, this may be just a loophole). Adding this command to the sound file can make the phone black!