Recently, a new dsi firmware has been made by nintendo. the purpose was to block:
•Acekard 2i-3ds,
•Iplay
•R4i cards
•etc.
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An update has been made for R4i gold flashcart firmware that will allow it to still be compatible on the dsi. Acekrds will no longer work, but ievolutions and sudokuhax carts were reported to still work.
~C.J.