At this point there is no exploit for the new GB OTA, but if you were rooted before the update, you should have maintained root. Go into your bootloader ( power + vol down IIRC) and look for either S-ON or S-OFF. If you see S-OFF, you still have root. You just need to reload the recovery.
Is that only for the EVO? I have a Droid 2 that is Rooted, but on stock kernal and ROM and I've deleted no applications. The GB update is coming soon for my device and I think I will lose root access with the update.
At this point there is no exploit for the new GB OTA, but if you were rooted before the update, you should have maintained root. Go into your bootloader ( power + vol down IIRC) and look for either S-ON or S-OFF. If you see S-OFF, you still have root. You just need to reload the recovery.
I'm going to guess that the OP probably doesn't have root access, based upon the lack of info provided in the post.
I'm curious as to why anyone would want to downgrade though.