Just got one of these from a friend, I don't really know if it works on the 3DS. According to the box and sticker, it's already been updated for DSi v1.4.4, and the site claims the 1.4.4 update works on the 3DS. The site has two cards for sale, a 3DS version and a DSi version, the latter being the one I now have. I put all the files on an 8GB, FAT32 formatted card, put the card in the R4i, and put the R4i in my 3DS. Nothing happens, there's just a blank icon like no card is inserted. Doesn't fit in the slot like a normal DS game card, I don't know if it's having trouble reading it or if it's just not compatible with the 3DS (which would explain the need for a separate 3DS version, I guess). If I can't get it to work, it's not a big deal. My AK2i should be here by next week, although it'd be nice to have a card to fall back on. Any help would be appreciated.