I've got the same problem. This forum is great, no doubt, but it's a MESS. I couldn't find a clear answer regarding flashing a CID LOCKED G4 Prophet.
Can I flash radio roms ? What about extrom ? Can I just flash Gullums Touch VII right away after flashing NVID rom from here http://forum.xda-developers.com/showthread.php?t=310452
? Can I even flash this NVID rom to CID LOCKED G4 ?
Lots of questions and for every one I can find 20 different answers, so I'm pretty confused. Maybe someone with the patience can clarify all of that, we don't want to brick our precious Prophets.