OTA Update Issue

[praeceps]

I have a Droid X, I rooted it, then I started getting OTA update messages. They wouldn't install. I had rooted using the method where you freeze the terminal emulator to give you root access, then you do the actual roting of your phone. I tried a factory wipe, and it still isn't applying the update. I'm currently at 2.3.151

What I was going to try is .sbf'ing it, but I couldn't find Droid X .sbf files.

So, does this sound like a good idea, and if it does, where can I find the .sbf files?