Here's some news that should be upsetting for those that enjoy the homebrew scene. A number of DS flash carts have been tested, and the results can be seen below.

CycloDS - Failed
G6 DS Real - Failed
M3 DS Real - Failed
Supercard DS One - Failed
iTouch DS - Failed
FCard - Failed
NCard - Failed
M3 DS Simply - Failed
U2DS - Failed

Looks like Nintendo is going out of their way to block any software pirates out there, but they are also killing off homebrew. Thanks to MrBubbles for the heads up!

Link