Some one is asking: Does 3DS flash card can be used for NDSi? Answer is yes!
3DS flash card is not only developed for 3DS console but it also works with NDS,NDSi,NDSL,NDSXL....That means is support all the modle consloe up to now. If you play an 3DS games in your consloe, it will be great, but if you just want to play normal games, it also works.
