You don't need to import a game.
Gateway 1.0 used a crude image writing system with 1 game per micro sd that basically turned the Gateway card into a 1:1 copy of the game. The good news is that this method keeps the update partition! So find yourself a copy of Gateway 1.0 (we can't link to it but get creative with the download urls on Gateway's site) and a rom of a 4.x game and get crackin. Just be SUPER DUPER CAREFUL to not have an update installed from Nintendo's servers. DO NOT CONNECT TO THE INTERNET EVER UNTIL YOU ARE IN 4.x EMUNAND.
Also make sure you don't update the FPGA of your Gateway card with the 2.0 release until you're on 4.x. Gateway 1.0 doesn't work with and updated FPGA.
Oh right. I guess I was thinking of the way of updating to 4.5 from 4.0.gateway only work in 4.0 through 4.5.TS refer to fw 1.0, so it is not possible to update to 4.5. he/she still need actual retail game
You can also make your real connection in emunand, and then just delete it in sysnand. I don't know about 3DS, but on WiiU having a fake connection set up leads to a bunch of annoying nag popups you have to dismiss over and over again, so just deleting may be the easiest thing.
So I also got my hands on the gateway and installed everything. Everything went fine, untill I installed emunand. It worked perfectly, but then I updates my emunand. Now, everytime I try to acces Emunand, it gives me a black screen. Does anyone know what I'm doing wrong here?
Thanks!