Hi, i bought a 3ds and a M3i zero card for my son. This card works till firmware 4.5.0. Now he made a firmware upgrade up to 5.1 (altough i said he should not make any upgrades). A downgrade of the 3ds-firmware ist not possible, mybe the card will be able to work in the future. Is there any other card which works with this firmware version?? Thanks a lot!