While a traditional "BIOS" (like those used for PS1 or DS) isn't needed, Lemuroid's 3DS core (based on Citra) may require to play encrypted games.
Acquire the files listed above (legally, these should be dumped from your own 3DS console). lemuroid 3ds bios
Emulators themselves are legal. However, downloading BIOS files or decryption keys from random websites is a legal grey area. To stay 100% legal: While a traditional "BIOS" (like those used for
: Some games (like Mario Kart 7 or Mii Maker ) may require system archives for specific fonts or Mii icons to display correctly. These are generally stored in the internal storage folder under Android/data/com.swordfish90.lemuroid/files/citra-emu/ . However, downloading BIOS files or decryption keys from
Lemuroid is a popular, free, open-source emulator available on the Google Play Store and F-Droid. It is beloved for its simplicity. Unlike standalone emulators (like Drastic or PPSSPP), Lemuroid is a based on the powerful Libretro architecture (the same core technology behind RetroArch).