Use APKPure App
Get Mass Storage Mode Note3*ROOT old version APK for Android
Hilft uns, zwischen MTP und Massenspeichermodus umschalten in (Samsung Hinweis 3: SM-N900).
This is a tiny android utility program which can be used for enabling hidden mass storage mode for various smartphones. This program needs ROOT privileges to do its operations.
This app is only tested in Samsung Note 3(SM-N900 Kitkat). In other phones, use this app with your own risk.