The only legal way to obtain your own prod.keys file is to extract, or "dump," it from a Nintendo Switch console that you personally own. This method ensures you are not facilitating copyright infringement. The process, while requiring some technical steps, is well-documented:
Take your prod.keys file (ensure it is named exactly prod.keys ). Paste it directly into the system folder. ryujinx prod keys 21
The term in your search refers to Firmware Version 21.0.0 . Each new firmware release from Nintendo updates these keys. Newer games (released after a firmware update) often require the latest keys to run. The only legal way to obtain your own prod
Nintendo regularly updates the Switch operating system. ; newer games often require the latest key set. Version 21.0.0 (and later 21.0.1) of the firmware and its corresponding keys was a significant release that enabled emulation support for many 2025/2026 game titles. Paste it directly into the system folder