Why won't JRD MMITest go away?
According to tnagy on the topic of JRD MMITest:


  This is the manufacture test of your Android phone's internal components. It will perform a check on the main components like LCD display, sound, etc.


You should be able to disable the app if you do not want this app to perform regular checks. 


From Settings > Apps, slide all the way to the right until you see the all apps screen (not downloaded or running). Scroll down to MMI Test and click on it. Note: On some devices it might be listed as MMI Test II, or some other derivative. 
After clicking MMI Test in your list of all apps, you should be able to Disable the app. This will keep the app on the phone, but it will not be able to run at all, even in the background.


If you want to permanently remove the app, you can root your phone and install an app like Titanium Backup, which can delete system apps, such as MMI Test.