: Be extremely cautious about where you obtain BIOS files. They should ideally come from official sources or be dumps from your own console, ensuring you comply with copyright laws.
If you want to run a 3DS emulator on Android legally, here are lawful alternatives: 3ds Emulator Bios File Download For Android
: Check the documentation or community forums for Citrus to understand if a BIOS file is required and which one. : Be extremely cautious about where you obtain BIOS files