How to uninstall a device administrator app that wont deactivate? My cousin decided to download an app on my phone as a joke. I tried to uninstall it but it just won't uninstall. It's an administrator app, I tried to deactivate it but it won't deactivate. Whenever I try to deactivate it, it shuts down my phone. What should I do?  I tried to root my phone and delete it that didn't work either.

How can I uninstall this app?
You can manually uninstall the app with steps below: 

ROOT IS REQUIRED

I am not responsible if you damage your phone, just follow steps below and nothing will happen.


Download a root file explorer like Root Browser from the play store.
Open the app.
Go to /data/app/.
Delete the apk of the app. 
Check if also a directory of the app exists in /data/data/. If so, delete that directory. (The directory is the package name.)
Reboot your phone.
The app now should now be uninstalled.