yes
This is not a simple answer... let me explain: If you have updated your DSi to version 4.0 then you CANNOT because this update will have blocked cards such as R4 etc. If you HAVE NOT updated your DSi to version 4.0 then there are two explanations. The R4 card will not work because they only work on NDS/NDSLs. However, you can use cards built for DSi like the AceCard and the DSTTI card.
All r4 3ds cards can directly support dsi console. No need to do anything. Just insert the r4 3ds card into the dsi console, it can be read.
No you can't use the original R4 on the DSI, but there is something called R4i that's supposed to work on the DSI.
You will have to buy R4i, because R4 doesn't work on DSi.
you can use a r4 for ds lites but with dsi's there is a different type of r4 sorry i dont know the name of it
yes, but you have to get a R4I card instead of just an r4 card
It won't work because the technology is different. And IT IS LEGAL CAUSE U HAVE 2 BUY IT! There are many r4 dsi cards in the world. They support Nintendo DSi and DS console.
I am inclined to say yes. Due to the fact that the DSI and the DSIXL are based on the same platform, do the same things, and operate in the same way. But you will need the R4I card. except the r4 ds card, all other r4 cards can work on DSi.
No, the R4 for the DS will not work on the DSi
From what I hear it is compatible. I am not compielty sure if it compatible. There are many r4 cards in the market currently. The r4 ds card is only for ds and ds lite. but the r4i card can run on dsi. Well, the latest version is r4 3ds card. It can run on Nintendo 3DS,DSi and DS console. If you want to get a flash card with good compatibility, I suggest you to got a r4 3ds card.
What!? A DS R4??? Well i presume you meen 'how do you make the DS have an auto boot R4?' (not possible!) Just buy an R4, theres no way you can have a DS what runs roms without an R4 (or any other flash cards) You can buy them here: http://www.r4i.co.uk/ (for both DS and DSi)