just update and it still does not work =='So looks like you'll need to install an update with a DSi or original DS as it won't properly work on the 3DS until then...
EDIT: and to answer your question.. Well which file are you referring to?
just found this: https://gbatemp.net/threads/release...cards-on-3ds-probably-n3ds-too.376719/page-25
acekard 2i does not work =='
