Hi, I'm noob
I've followed this guide when I installed my CFW
https://gbatemp.net/threads/tutorial-setting-up-9-0-9-2-n3ds-xl-for-cfw-including-emunand-coldboot-cia-installer.405589/
I've played online for longtime and never have any trouble.
Until the latest, Bokujo Monogatari, I've got its 3ds...