Having problems with custom ROMs? Or perhaps you want to just return your AT&T Galaxy S3 SGH-I747 back to AT&T for warranty purposes?
No worries, it’s easy to unroot/unbrick your AT&T Galaxy S3 SGH-I747 completely back to stock. Follow these directions here and you will be good to go in no time.
If returning your phone for warranty, you can try running TriangleAway app to reset your binary counter. SGH-I747 isn’t supported at the moment by TriangleAway app as of this writing but might be by the time you read this. After that, you can run ODIN, as this unroot method doesn’t increase binary count.