Nintendo released the DSi new Firmware V1.4.3, which added nothing, just block most flash carts.
other flash carts such as m3i zero, acekard 2i, DSTTi, R4i SDHC ect… still can’t work on V1.4.3 firmware.
I think they will pass soon.
If you are a Nintendo DSi owner and want to use flash carts, i recommend you don’t update to V1.4.3 now.
You’d better wait some days, when the updates and patchers work steady, then update.