Thanks for the confirmation, apparently I am an idiot that didn't notice the guide A) Has you system update the console and B) explains what CFW means :blink: Looking forward to playing the mod!
I'm sorry if this isn't the right place to ask this, but it does pertain to this mod. I've got an old 3DS with the proper version number (11.0) to get Homebrew and LumaCFW onto it with soundhax, following the guide linked in the OP. US and UM require a system update to 11.4, which breaks...