This app was mentioned in 4 comments, with an average of 6.75 upvotes
If by EX you mean FX File Explorer, it requires an addon on the Play Store called FX Root Addon (something like that).
https://play.google.com/store/apps/details?id=nextapp.fx.rr&hl=en
Then when you're looking at the directories in FX, you need to choose System (Root) and it should prompt for root.
>I actually went from FX to ES because it wouldn't allow me to edit root files. So not EVERY way.