There are several places you can get a backup image from. You can post a request in the image begging thread found here, contact Stan Simmons over at the TCF and request access to his FTP site in this thread, or purchase InstantCake from PTVUpgrade for your model of Tivo. You can also download images from several of the peer-to-peer networks like KaZaa or edonkey.
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!