How can I remove a System App from my rooted phone? I have rooted my device, and removed several System apps successfully, including this one. However, I then accidentally restored this particular app and now I seem to be stuck with it. 

I've also tried deleting it's file through a few File Management apps, but to no avail. 

The problem is, I think, that when it was restored, it was restored as a System App for the root, rather than as the regular system app that could be removed, that it was originally. If this is the case, is it worth trying to unroot my phone?

This app that I'm trying to remove is YouTube, by the way.

Any ideas?
Have you tried rebooting the device? Also you can try removing the app with Purify if you rooted your device with KingRoot