As we know that yesterday the 3ds firmware has been updated to V7.2.0-17, check the post here: this is just an update of the news that i have confirmed most flashcarts can still work on the new 3ds firmware.

Still working

Supercard dstwo
r4i gold 3ds
r4i sdhc dual core
r4i-sdhc 3ds
r4i gold pro
ace3ds plus

Not working

Acekard 2i

As long as your card can work on the last firmware, it should be also working on this V7.2.0-17. Feel free to update it.