M3i team released the update for Nintendo DSi v1.4.2 shortly after almost all flashcards halted by the DSi new firmware upgrade last month.We’re here again with another round of updates for 3DS consoles.M3i zero Quick on the Trigger, fixes 3DS 2.0.0-2U/E/J firmware.

Quote from M3i official website:
"
M3i Zero works fine on JAP, US & EU 3DS console with the new released version has been confirmed. 10-6-2011

Please be sure to update the M3i Zero to Core 2.0.2 to support 3DS new firmware Ver. 2.0.0-2U/E/J
If you have SD card compatibility issue on 3DS, try to use M3GUpdaterPlus_142.nds to upgrade with compatible SD card or on NDS/NDSi to complete."

Download M3i zero update for DSi v1.4.2
Download M3i zero update for 3DS 2.0.0-2

thanks for sharing,so at present,there have following cards can work on both DSiv1.4.2 and N3DS V2.0.0 now :

r4i gold 3ds
r4i ds gold
r4i-sdhc 3ds
M3i zero
Supercard dstwo
acekard

and i think more and more flashcard will join this list,maybe just the matter of time.