As we had imagined, original Nintendo DS and DSi flashcarts are not functioning at all on the Nintendo 3DS. Members of our forums have tested compatibility with multiple cards, and results are 100% negative.
Tested flashcarts so far:
Supercard DSTWO
Supercard DSONE
R4 DS
EZ-Flash Vi
Quote Error:
エラーが発生しました。 An error has occurred.
本体の電源をOFFにし Please shut the power OFF
本体の取扱説明書の指示に and follow the instructions
従ってください。 in the user manual.
From the first reports we've received, the flashcart icons show up normally in the 3DS menu but refuse to launch. Will flashcart manufacturers release firmware updates to bypass the new protection of the 3DS? Hard to say, but they are probably at work already. The first team to break the 3DS protections will certainly receive great praise from the community.