This should be obvious news since Nintendo built the DSi with a new firmware, but it doesn’t work with existing flash cards. Sorry, legitimate homebrew community. How do we know this for sure? One Nico Nico user tested twenty eight different flash cards. I can’t believe this many flash cards exist in the hands of a single person.
Here’s a link to the video , but you need to be a registered Nico Nico user to watch it. If you’re not check out these screen captures.
Images courtesy of Nintendo / Nico Nico Douga.