Which 3ds flashcard has not changed its hardware ever since release of 3DS console ? EZ Vi, AK2i, M3i Zero, DSTTi, DSONEi, iSmartDS, R4i GOLD PLUS and DS2.
However, as Nintendo updates 3DS system now and again, EZ Vi, AK2i, DSTTi, DSONEi, iSmartDS have all been out of production, M3i Zero does not support firmware higher than 4.5.0-10. There only left R4i GOLD PLUS and DS2 supporting all current 3DS systems without any hardware change.
R4i GOLD PLUS, the best R4 card for DS gaming on 3DS !