In this guide, you will find out how to fix RYU-0003:Firmware Parsing Error Outdated Keys in Ryujinx. You just have to follow the simple steps below to get rid of this error.
To solve this issue, you have to make sure that you have the latest prod. key. For this, you need to click on the Download button below to download the Prod. keys. After that, open the emulator, click on the File button from the top, and then tap on the Open Ryujinx folder. Go into the system folder to paste the latest prod key file and your issue will be fixed.