I personally shop with dscardworld (and they're great, but that's because I live in the US. DS cards unfortunately don't last forever, and teams eventually stop supporting the cards - but the fake ones are terrible at this to be honest! Your best bet is to buy an authentic card and simply buy something decent that's upgradable. If you're using a fake card (such as the R4i Gold, R4i Ultra etc.) then it's quite likely the card simply isn't supported and you'd need to get a new one. has an info page and a video to show you how to update a legit R4i card (NOT fakes) - click here to visit the 1.4.3 R4i Update page. You need to do this on a 1.4.2-or-below DSi console, or a DS Lite though.

Also see, they're pretty useful for R4i card info) then you should be able to update the firmware of the R4i card through the 'Settings' menu of the R4i. If you are using a genuine R4i 3DS card (check on the website by the way, they do a pretty good guide on the different types of genuine / fake cards. Once your DSi console has been updated to v1.4.3 firmware it cannot then be downgraded.

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