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

[datapusher]

UPDATE:

Fear not people, I got impatient while waiting for an answer to the question I posed earlier. So I just did it.

Good news is, my phone works fine. I ended up extracting the signed nbh file out of the latest HTC update. I then ran the rom update utility. All seams to be running as needed for Sprint exchange.

I did not re-lock the phone however.

I took it into Sprint and they checked it out. i will get my replacement sometime next week.