Ahh, the trusty ol’ SBF file. The file that can bring you back to a stock state should you do something drastic to your phone and actually screw up. This DROIDX Gingerbread (4.5.596) version would be one that you’ll want to tuck away for safe keeping. We should warn you though, that using this will drop you to a clean and unrooted official Android 2.3.3. And that means you won’t be able to get root since 2.3.3 has not been rooted yet.
*File is super compressed and will need 7zip to unpack it.