dsi help

hi can i get some help i got a dsi that was bought in june this year in uk...now my mate wants me to do a r4dsi but have been tiold that it may not work due to 1.4 firmware
can someone explain to me either on here or via pm what i need to do to get one working i have not bougfht one uyet as im scared its a waste of time to do so
im an old man so please explain as if you was talking to a 2 year old so i can understand

R4i's are no longer updated from what I know.I'd suggest buy an acekard 2.i-they are still updated.But if you wait there may be other answers from r4i users...so hang tight :)

what do you mean by updated just put new firmware onto mem card like the old r4 card?
where can one get a genuine card your on about?