As far as I know, no DS flash cards will work in the DSi. And my guess is that's not going to change. As someone pointed out to me earlier on this forum, it wouldn't make sense for these companies to update the firmware for their cards at no cost to the customer, when they could easily make the updates themselves, and release these "new" cards with an "i" at the end of their name. You're just going to have to bite the bullet and get a new card I'm afraid.
i am not too sure if m3 real will work on dsi but i bought a dstti from http://www.i'manidiot.com edited by ddp and it worked perfect on dsi ... check it out mate
M3 Team's iTouch2 is out and compatible with ALL versions of DSi Those are quality flash cards, u can check out www.mygamingmart.com - should be carrying it!