So recently I changed my ROM because the official build was bugging but for some reason the right CM10 ROM for the T999 was not working so I tried another, the MetroPCS ROM, which did install for some reason but I can't get any phone service. Since, I have not been able to return to my backup as the models do not coincide.

I have tried to return to the stock ROM and unroot but the phone is not recognized through Odin in Download Mode which makes it impossible to install the official ROM. W

What do I do?