has shared via YouTube a video of their flash cart working on the Nintendo DSi in a LAB environment. However, they admit that even though they can get it running, it is almost impossible to make a commercial product out of it.
To quote: This is a lab work, it works ONLY in LAB. Even though we can go this far, it is almost impossible to make a commercial product.
There is a major problem that can't be resolved, at least for now. It seems DSi did many sanity checks to make sure there is no more fcards.. we will keep researching and good luck to all.
BTW: We assume there are more than one modes on DSi, we still haven't found any way to access the SD card slot in origin DS mode.