From what you said and posted, this is what it sounds like.
First it prolly did get unlocked, cuz you cannot flash a custom rom without it being unlocked!
Easiest way to tell, put it in bootloader mode and post what it says.
If bootloader is correct, then what you have is a gps rom with a NONgps radio. Which the result will be stuck on splash.
Latest stock sprint rom which has gps radio in it.
http://www.htc.com/us/support/mogul-sprint/downloads/