Root [AT&T] Can't edit system files

[Mike1215]

I have a rooted AT&T S4 (I337). And I watched a video of a guy who downloaded an app and simply changed a file in the system folder. When I attempt this, all (I've tried 4 of them) file editors either freeze or say "Failed" when renaming.

Here's ASTRO:

Anyone know why this is happening?

 

[AlexRayquaza]

Download ROM toolbox from jrummy and then open the app.
From the first screen ,scroll down to where it says scripts.
In the menu should be a script that says "mount system as r/w"
Tap that and grant it root permission.
That should allow you to edit system files.

 

[Mike1215]

Thanks for the quick response. I remounted the system as rw... but it didn't work for some reason.

Tis all good now though.

 

[AlexRayquaza]

Alright friend.