As far as I know, this rom was made for Verizon Samsung Galaxy SIII with a locked bootloader (I535VRUDNE1). I am not sure if there are module patches that can make this rom work with GSM carriers like AT&T. I am not sure why you are installing this rom to your AT&T SIII. For AT&T Samsung Galaxy SIII root and custom rom info, please check out this sub forum at here
I know there is a CF Auto Root for Verizon SIII (I535VRUDNE1) 4.4.2. Does anyone know if that will work on I535OYUDNE1 (4.4.2)?