EmuDeck does not provide BIOS files. You must dump them from a Nintendo 3DS console you own. Downloading BIOS files from forums is copyright infringement and often unsafe (malware risks). We will focus on the legal, safe method.
: Required only if you are using encrypted (.3ds or .cia) files. nintendo 3ds bios emudeck
Emulation/ ├── bios/ ├── roms/ │ └── n3ds/ └── tools/ EmuDeck does not provide BIOS files