It does? I always heard that DS flashcarts didn't work in emunand, just due to the way emunand runs. Interesting!
If it worked on before (likely with the help of bluecardfix or flashcardtimewarp), it will work on 10.4 but DS flashcarts only work in sysnand. *Do not update your sysnand*
This is a misconception. DS Carts (including flashcarts) force the system to soft-reboot, which results in the twl_firm being loaded from sysnand rather than emunand. That said, with every cfw EXCEPT rxTools they will launch from emunand just fine.
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Which version of rxTools? DS cart loading was broken on the nightlies for a long time. I thought it still was.For rxTools they work on emuNAND. At least my DSTwo (the old) works perfectly.