If running the .3dsx file does not work, the community suggests a few alternative methods to restore Mii functionality:
: You can download pre-compiled "3DS Shared Data" archives (like those found on MediaFire) and extract them into your emulator's nand folder to provide the missing fonts and textures. Errfix.3dsx
For most desktop emulators, place the file in the same folder as your game's executable or ROM. If running the
Are you running into any or using a particular emulator like Citra or Folium that still won't load the faces? Fixing your Mii faces generally follows a straightforward
Fixing your Mii faces generally follows a straightforward process across most platforms, including PC, Steam Deck, and mobile devices:
Errfix.3dsx is a homebrew application used primarily to fix "broken" Mii faces in games like Tomodachi Life and Miitopia when running on emulators.