I just got mine back up and running with 2.1...used info from a post from humungus (thanks!)
Heres how I did it
1. Flashed the SBF using RSDlite using this guide
Droid X SBF .604 available thanks to Phoxus - Droid X Rooting - AllDroid Public Board - Droid X SBF .604 available thanks to Phoxus - Droid X Rooting - AllDroid Public Board - AllDroid.org > Home
(Note you will have to get the SBF from one of the 'other' sources)
2. Then you will get a bootloop
3. Go to recovery (power off, hold home, press power still hold home. When droid with ! shows, release power and home, press search button)
4. Wipe the cache using menu option
5. Wipe data using menu option
6. Reboot
*you should now be back to bone stock*
If you have a boostrap recovery like I did...
7. Re-root using any method you want
8. Install and run bootstrap like you did you make the recovery
9. Restore the recovery
*now you are up to date as far as your bootstrap recovery*
Hopefully this helps anyone who wants to revert.