So, you want to unroot your T-Mobile Galaxy S3 SGH-T999 completely back to stock? Well, I know a lot of you requested this so here’s how to do it easily using ODIN.
Step 1. First, I suggest you to reset the ODIN binary counter by using TriangleAway app. At the time of this blog post, TriangleAway app does not support T-Mobile Galaxy S3 SGH-T999 but by the time you read this it might be supported so go ahead and download the TriangleAway app apk, install, and see if it works. (You can download it here on XDA, you will have to register for a username, it’s free.)