Revert to total stock?

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http://androidforums.com – I got bored over the weekend and root and romed my S3. I didn't like the roms I got so I wanted to go back to stock. Problem is I forgot to do a backup of the stock firmware before flashing. Is there a way to get back to true stock? I have flashed stock firmware back on the phone, but when I try to get the VZW update, it fails. Thanks for any help. (General)