Help with R4i SDHC 3DS V5.0 flashcart On 3DS !

I got an email from a flashcart users .

I recently purchased an R4i SDHC 3DS V5.0 Card and outfitted it with the latest kernel download (V1.80b). I'm trying to use the card on my 3DS which has the latest version update (9.0.0-20U) but it is not working.I realize that I need to update the card's firmware itself but when I try to update the card via my DS lite the upgrade screen does not show a later version that I can upgrade to. What am I doing wrong?

I checked for him and found the R4i SDHC 3DS V5.0 Card has stopp production last year,you can check the official site as well,maybe that is the reason why you cant update your r4 card and use it on latest v9.0.0-20 . But their latest revision r4isdhc rts 3ds like this one :http://www.usar4.com/r4isdhc-3ds-r4isdhc-rts-3ds-flashcart-for-2ds-3ds-xl-3ds-dsi-ds-lite-p-4.html  , supports future update and can directly work on 3ds v9.0.0-20, so if you want a card to work on your N3DS V9.X.X,you can contact the seller you bought from to exchange a working one or just directly buy a new one from a reliable store .