There are so many different versions of R4 cards and also the Gateway Card, so could you help me out by advising me which is the correct R4 card to buy to be able to play the 3DS roms downloaded from the net.
gateway 3ds only works on system version 4.1-4.5 3ds consoles, if you have updated your system to the latest version, I'd recommend buying the wood gold r4i card http://www.thegamerdepot.com/buy-wood-r4i-gold-3ds-card-for-3ds-xl3dsdsids-p-150.html hope it helps
If your n3ds/xl firmware stayed on v4.1-4.5,you can use r4i gold 3ds deluxe edition play 3ds games on your console,this is the only one r4 card to support 3ds rom,yet,compared to other powerful 3ds game card,i dont suggest you buy this r4 card,recommend you buy gateway 3ds or mt-card.If your N3DS/XL firmware higher than 4.5, then you can buy r4i gold 3ds like this one : http://www.modchipfactory.com/wood-r4i-gold-3ds-flash-cart-for-3ds-xl-3ds-dsi-and-ds-lite-p-1.html ,this is the best r4 card for nds games or homebrew.