I did something like this with my Nexus (don't have your phone, just reading), but Sprint couldn't/wouldn't do anything after I unlocked it. I mistakenly used GSM rather than CDMA root files (too new with not enough info out there). Very upet.
I had to call Samsung and they had a program that I downloaded that completely reset the phone to factory, it was called Samsung SimpleDL for SPH-D720. They had one for each phone.
I downloaded, ran this. It was nerve racking not knowing what to do, I was on 2nd day of release, but it completely wiped what I had done and put it back to factory. It takes a while, looks like nothing was happening, but got me back when nothing else did. I have also used that on one of my Epics.
So look there, it might help you. It is completely different than Odin and files. Good luck.