My 2 cents knowledge, you can try this method

1) First install ES Explorer from google store

InkedScreenshot_2018-04-30-20-55-41_LI.jpg

2) Choose Device

InkedScreenshot_2018-04-30-20-56-00_LI.jpg

3) Look for System

InkedScreenshot_2018-04-30-20-56-21_LI.jpg

4) Look for App or similar App name

InkedScreenshot_2018-04-30-20-56-36_LI.jpg

5) Do a search for the default app that you are missing

InkedScreenshot_2018-04-30-20-56-50_LI.jpg

6) I did a search for music.apk

InkedScreenshot_2018-04-30-21-11-31_LI.jpg