Select and then choose Install a firmware from XCI or ZIP .
Alternatively, use the official web viewer: ryujinx.org/compatibility ryujinx firmware latest versions and compatibi link
The latest firmware version is 18.1.0 (as of late 2024/early 2025). Ryujinx developers typically support the current firmware within days of Nintendo releasing it. However, some users prefer staying one version behind for stability with older game mods. Select and then choose Install a firmware from XCI or ZIP