You need to leave the Tivo alone when you get the GSOD. The Tivo has detected an error in the filesystem and will attempt to correct it on its own. In most cases this can take as little as 15 minutes to accomplish but sometimes can take much longer. If the problem persists and does not correct itself after 24-48 hours then your backup image is probably hosed and you'll need to get another one. Also, make sure you've allocated a large enough swap space during the restore process (the -s 127 command with mfsrestore). Otherwise, the Tivo will never be able to recover from the GSOD sincew it uses the swap space for the repair. If it's too small it can't fix itself.
Please don't PM me or any other members looking for personal assistance. You'll do better by posting (after you've exhausted the search feature, of course) and taking advantage of the collective expertise of the membership instead of a single individual that may or may not be able to help you. Thank you and enjoy your stay at DDB!