This is how us Droid 1 users flash sbf files. I would assume its the same but I dont have a Droid X so I really dont know. Try this at your own risk. I take no responsibility for bricked phones. I took out some links that were to files for the Droid 1.
[Hide] *I just want everyone to know that I didn't write this guide, just the first paragraph. You can thank ikithme for the guide.
Now that a .sbf file has been released for our Droid's we can always recover them using RSD Lite. it is pretty easy to use this. Of course if you physically break your phone it won't help, but if you screw anything up software wise you are covered.
If you unplug your phone while doing this it will break it beyond repair, Verizon will not be able to fix it. DO NOT ATTEMPT THIS UNLESS YOU ABSOLUTELY NEED TO USE IT!
Here is a guide.
Requirements
A. A stock sbf file
B.
http://androidoverdrive.com/downloads/RSDLite4.6.7z (RSDLite 4.6)
C. Motorola Drivers
Make sure you download the correct drivers for your system either 32bit or 64bit
Instructions:
1. Download all of the files above including the 32-bit OR 64-bit Motorola USB Drivers.
2. Install RSDLite AND the 32-bit or 64-bit Motorola USB Drivers (Depends on your system most will need 32-bit some will need 64-bit)
3. Connect your phone to USB and turn it off then turn it back on, while your phone is booting hold up on the DPAD. (Some users have said it is easier to hold the volume down button and camera button instead.)
4. Run RSD Lite 4.6 as Administrator (For all you Vista and 7 folks out there. If you are using XP you may not need to run as Administrator)
5. Click the ... next to the filename box and browse to where you saved the .sbf file and double click the .sbf file.
6. Hit start and below it should give you completion progress and all of that.
7. Once your phone is done being flashed (It may take a while so don't unplug it) it will reboot and you will be back at stock 2.0.1 no root.
8. Done
Credits:
dordodim for the sbf file. ikithme for guide.
Motorola for the awesome phone, usb drivers and RSDLite.[/Hide]