Well on my side I HATE KINGSTON the cards they make are SUPER slow but thats wat i think last time i had a 4gb and a acekard2i i tried playing super mario 64 ds on it it TOOK 3 mins to load .... so yea kingston = fail but I WOULD use the card i said worked also the 2gb sandisk works 0.o so u can...
like I said u COULD try to do the following = 1.try a other Sd card 2.try to upgrade ur firmware 3.u could change the sav type to 1M on the menu of wood 4.IF ALL ELSE FAILS u may need to buy a new card??
Confirmed working on the following Micro Sd Cards = Sandisk 8GB class 2,team group 8GB class 6,And Sandisk 2GB class 2,Confirmed NOT working with Sandisk 4GB all sd cards tested with a acekard2i running AKAIO 1.7.1