well first off i rooted my phone a couple weeks ago and installed superuser or that ninja guy to root my phone but i got tired of seeing that ota instal 2.1 update so i just agreed to update and i guess it unrooted my phone. now im trying to go back to 2.0 to root my phone with that .sbf file but everytime i try using rsd lite it says failed and on my bootloader screen it says critical error 1337 510b. anyone know what this could be?
I googled your problem and came up with what I think is an answer right here in Droid Forums.
Hope it works.
If you made a backup prior to the OTA try restoring. That may get you to a place when you can have root and proceed as you want.