Sprint stock ROMs and relocking

[neodorian]

I'm returning a faulty Mogul and I need to get it back to stock. I have the relocker on my MicroSD card but if I understand things correctly, I need to flash back to stock first and then relock. I downloaded the ROM from HTC's site but it gives me an error when I try to run it. I can always try from another PC but I have run ROM update utility from this PC before. I poked around and found what claimed to be a stock ROM on this site but it got to the tricolor screen and then started updating before saying that this ROM was not for my device.

Anything I am missing here?

Thanks.