can we ?

Can We download and ply demo game " via download play" ( dsi application ) if we are not update our dsi ?

In order to use the Nintendo networks stuff, you will likely need to update your DSi. (I'm not 100% sure, but the Wii makes you update to go onto the Wii store).I wouldn't recommend doing it if you do not have a flashcart that has a 1.4 firmware fix yet.

thanks, I have dstti so....
Is it still just EZ card with ability to update ?

Acekard2i, SupercardDSOnei, R4i, EZFlashVi... M3Zero does I believe.