This homebrew tool is essential for installing games (CIAs) directly on your 3DS.
The Ultimate Guide to Nintendo 3DS ROMs: Preserving Your Digital Library (2026)
These are "Container Installable Archives," which are installed via the FBI app to appear directly on your 3DS home menu.
A powerful tool for dumping your own cartridges and managing files. 2. Understanding ROM Formats (.3DS vs. .CIA)