I have a rooted AT&T LG G2, trying to add two lines to the bottom of my build prop list so I can edit the "type" setting on my APN, it's currently greyed out. None of the editor apps that I downloaded from the Play store are letting me add the two lines. Can open the build prop file but nothing happens when I start typing. Have tried Build Prop Editor, ES File Explorer and Root Explorer, switched R/O to R/W, same deal with all of the apps. Any ideas on what the issue is?