Keys 21 — Ryujinx Prod
Nintendo released System Firmware 21.0.0 in late 2024/early 2025 (depending on your region). Unlike minor patches that simply fix stability issues, version 21.0.0 brought under-the-hood changes to the Switch’s encryption and security modules.
Keys alone are not enough. You also need the firmware files. In Ryujinx: ryujinx prod keys 21
Even with “Ryujinx prod keys 21,” you may encounter issues. Here are the most frequent problems: Nintendo released System Firmware 21