How can you put a game and all the levels reached before making a card game on Nintendo DS?
My nephew has come at a much Ben 10 in his game and when he took the card to test a new set of Ben 10 and reintroduces it was like starting from scratch. Tears and frustration once and I want to assure that does not happen again!
Sorry, but you can not recover data that has never been written, it is enough to convince his best to start again, as he know what you're doing now.
Nintendo DSi – SD SDHC Memory Card Tutorial – How To