I have a Samsung Galaxy S4 (SGH - I337) for AT&T (unlocked). I wanted to install the 4.3 google edition software on my phone.
Every time I boot the phone, I get the error, "System software not authorized by AT&T has been found".
I have been at this for hours and hours, reading this forum, searching, google, and cannot find a solution.
Basically the only thing I can do is get to TWRP v126.96.36.199 when I first start the phone, or read the error message above.
I would like to find out how/what I would need to do to get passed this error and start using 4.3 google edition, or revert my phone back to its original state.
PLEASE any help is very very much appreciated!!