Originally Posted by creep138
You have to Odin back to it. Google is really everyone's best friend. Just use triangle away first before using Odin.
Just search sprint s3 unroot method
Sent from my SM-T217S using xda app-developers app
i know. I spent this whole time looking and none of my questions were answered. However, I luckily did find what I was looking for.
1) Stock 4.3 ROM in flashable Odin format
2) Triangle away to be accepted to T-Mobile Uncarrier program
Triangle away wasn't needed for T-Mobile carrier switching. It only looks for a custom ROM and root. Since it was an offiicial ROM and unrooted, it had passed.
So, I had figured it out myself, mostly without google. No need to assume I hadn't attempted to find it first