When devices get the newest OTA, one of two things happens to root users. They either stay on the old firmware until a rooted version of the new firmware is available for flashing, or they get overzealous and flash the OTA and lose root. This can be a particularly frustrating, especially when there’s no easy root method for the new firmware. We’ve written about the the struggles users go through to get root back after losing it. Unfortunately for some phones, the newest OTA’s never get rooted.
Motorola Droid X users can now breathe a little easier because the latest .621 OTA update has been rooted. XDA Forum Member frankc123 has posted about a method that will get users rocking the latest OTA back to superuser status.
The method is not exactly a walk in the park. It requires members to go so far as to boot into Linux and perform a SBF flash that will get the rooted .621 OTA on your phone, replacing the non-rooted one that’s probably already there. Those who aren’t already running Linux will have to create a live CD, adding a couple steps to the process.
More information, full instructions, and download links can be found in the original thread._________