So did I, but the internal memory was TRASHED, and it wouldn't restore or anything. It didn't come with a card, so I transferred my backup to the SD card from my camera, and that worked fine. (Boot order is Card => internal memory) BUT it was much slower than using the internal memory, so I wanted it fixed.
In the end TomTom renewed the main board.
Guess I should have a go. I can always go back to using a card if it breaks again.