use nimbus to make sure ur using pretendo and if that doesn't work i recommend ctgp7, a mk7 modpack with its own servers so it will work even without pretendo

thanks a lot. i use already nimbus to have pretendo, but mk7 doesnt find online players. If i patch mk7 with this modpack, my original 3ds game mario kart 7 will be 'modified' or patch will be uninstallable if not work? thanks a lot

Did you received a particular error after some time? Did you make sure that you updated mario kart 7? You should see "Ver. 1.2" on the online button.