LOL. It says 3DS on the box but it can't support the 3DS.
I've looked on the carts website and it doesn't say a thing about the cart supporting the 3DS so I guess you're out of luck.
I would suggest that you get a flashcart that isn't a cheap crappy R4/DSTT clone. Try getting a AceKard 2i as they are only a little more expensive but theyt do work on the 3DS.