@leontas2007 you'd be better off not using it - if you want to use it, you need to keep an emuNAND (not follow the Move emuNAND page) and also keep both your emuNAND and sys ion 11.2 or below. Gateway won't work on the emuNAND on 11.3 or higher, and if you boot Gateway in sysNAND mode on 11.3 or higher, your b9s installation will be removed and you'll have a stock console (and if you use an N3DS you might brick). It's dangerous to keep using Gateway. What you might want to do though is get it working, then follow
https://gbatemp.net/threads/importing-gateway-saves-to-cia-games.425743/ then follow the Move emuNAND page and update, and sell the Gateway card.