how mod tomodachi life?

you need to download onionfs then go to ur sd card luma then if its not there make a folder called plugins go in that create a folder with the tomodachi life title id (it depends on the region of your console) put the sd card on your 3ds boot tomodachi life and shutdown

go to the sd card on ur pc and open the new onionfs folder then you should see a folder called romfs put the tomodachi life mod there (btw on the folder with the title id is where u have to put the onionfs thing and on the onionfs folder u download only copy the file