Updated Big Red GS3 to 4.1.2, got the dreaded "System Software not Authorized by VZW" message...help

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http://forums.androidcentral.com – I have a rooted, stock GS3. Waited a few hours for others to update to 4.1.2 and someone said they used Voodoo Rootkeeper to temp unroot, updated, and everything was fine. I did this also, and my phone updated and rebooted. But now it says "secure fail: kernel" in the upper left of the screen and there is a big message on my screen that says, "system software not authorized by VZW has been found on your phone. Please turn off your phone and go to the nearest VZW store for help." Can't get anything to load now. I have been regularly backing up data via Titanium Backup. Ca (HowTos)