The Switch firmware contains essential system modules, fonts, cryptographic keys (indirectly), and libraries that games rely on to boot and run correctly. Without the proper firmware files, Ryujinx cannot:
Thus, you need a that extracts firmware from official Nintendo updates. The most reliable, community-vetted tool is: ryujinx firmware latest versions and compatibi link
Alternatively, use the official web viewer: ryujinx.org/compatibility cryptographic keys (indirectly)