just a few hours ago, nintendo 3ds system has been updated to 4.3.0-10. this new firmware has blocked flashcarts again, i have tested a few cards and just check the list below. If your card is not on the working list, do not update your 3ds. Remeber never update your 3ds before you update your flashcart. V4.3.0-10 Working list R4i gold (should be the one from r4ids.cn here: http://www.dsflashcart.com/r4i-gold-3ds-wood-r4i-3ds-flashcard-for-ds-dsi-3ds-p-248.html) supercard dstwo Ace3ds plus V4.3.0-10 non Working list Acekard 2i R4i sdhc 3ds .... many other cards.
Tested my Ace3DS PLUS as well,it still work well after updated my 3ds to 4.3.0-10.Now,you can take easy to update this card too. Hope this shared experience will helpful.
Yeah, Another card called R4i-gold pro also can work on the latest 3ds v4.3.0-10, I got some more details from here :http://www.gamekool.com/