When i first got my dx it had the 2.1 then, two days later the update hit. I was not aware that the bootloader changed. I tried to revert to 2.1 because I loved the swype and lock screen better.
Anyways when I SBF'ed to 2.1 I had the bootloader error messege, cannot program, battery low messege.
I had to lie my way of getting a replacement at no charge, blamed it on a low battery when that OTA took place and died during the process.
Well I have a nother one now. But now there is a full SBF file floating around the web for the 2.2 hopefully, you can SBF that to restore your device. As reverting backto 2.1, i thing it will be a sign of the past.
I recomment you try the Full SBF 2.2 with the new RSD Lite 4.9 that requires no patch and see if that works for you.
I want to be optemistic and not a downer, but for now you have a nice pretty brick. You can call Verizon and say that you forced the OTA manually and thats what happened afterwards, since you never got the 2.2 OTA update via OTA and play dumb and see what happens.
Good LUck and post your results in either route you choose to take.