I just bought a 3DS today and it requires an update to use the online store. Can I update without losing the ability to use my DSTWO card? And will updating ruin any chance of using a possible 3DS flashcart in the future? Thanks
The update from the supercard website updates the firmware of the DSTWO cart, to allow it to work when you (later) update the 3ds via the normal nintendo method.
If your 3ds is under firmware 4.5 you may want to hold off on updating though, as the gateway 3ds wont run on anything above 4.5. If you have no interest in 3ds mode flashcarts then update all you like I guess