The v18.0.0 update (and its subsequent v18.1.0 revision) was a significant one. This keyset allows Ryujinx to support games and system functions from the corresponding Switch firmware version 18.0.0 and above.
Navigate to the system folder. Copy and paste your prod.keys file here. Ensure the file is named exactly prod.keys . Ryujinx Prod Keys v18.0.0 - Latest Product keys...
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In the file explorer window that pops up, open the folder named system . open the folder named system .