FlashMe should also disable the signature check in DS Download Play. I've heard that the firmware is inaccessible from DS mode, though, so it probably won't work.
Fabis94: the DSi flashcarts don't run in DSi mode. The CPU speed is throttled down, the RAM is limited to 4MB, and the new WiFi features, firmware, and camera stuff are inaccessible.
There was apparently a Mac version a few years back that no one really picked up on, if anyone's interested:
http://erix.lu/exe/games/ds2key
The code seems to be substantially different so I doubt if it could be merged in.
Nintendo have made small changes to VC games in the past. They translated Sin and Punishment. They transferred photos from Pokemon Snap. Chances are they do have a lot of the information associated with these games in storage.
Are the pictures registered within the DSi system, or on the SD card? I guess this could be tested by swapping the card among different systems and seeing if the pictures appear.
I could see Nintendo storing a checksum as well as file size in their collection.
Lastly, their security with the...
Just curious to see what would happen, though I'm not expecting much. I have a DSi but my flashcart hasn't arrived yet. I searched and found some mentions but no results.