Dangers of downgrading after installing GPS radio (and a little on signing)

[theonlytnb]

I COULD really use some help.
I have a sprint touch which probably did not have a gps radio onb it. I CID unlocked it with the .41 unlocked I believe (ie. the unlocker for non gps devices I thought)
Then I flashed it with OMJ's Stock ROM. After that it wouldnt boot up all way- just said HTC Innovation or something like that.
Then I tried to flash it with the official stock htc rom posted somewhere on here, and then it would stop at 29 percent and be stuck in bootloader.
I then flashed it again with OMG and it cam eup and said "NO RADIO" and wouldnt boot up.
I have it in rainbow bootloader mode now and dont know what to do with it.
IF someone will help me I would really appreciate it, and if i get it working as a result of your help then my paypal will be very grateful as well.
Thanks