If I remember right you said verizon.. could be wrong but hey.
If it IS verizon, you know what they would tell you if you went back and "downgraded" and they noticed?
"You need to install the latest firmware, so lets wait a 1/2 hour while we do that now"
Don't go back. It just causes more problems. Just don't be like OH I upgraded firmware! Don't ask, Don't tell ;)
I had a razr v3m with them, hacked it all the time (changed the front screen from orange, the ERI Banner, stuff like that)
Just don't tell em, they rarely notice. They DO check for latest firmware, but that is their way of getting out of warranty replacements. "Oh, it was just that you had an older version, try this and come back with problems"