You can use GodMode9 on your 3DS to convert .3ds files to .cia format for easy installation. 3. How to Install ROMs on Your 3DS
These are "Container Installable Archives," which are installed via the FBI app to appear directly on your 3DS home menu. Nintendo 3DS Roms
The Ultimate Guide to Nintendo 3DS ROMs: Preserving Your Digital Library (2026) You can use GodMode9 on your 3DS to convert