Go to nand > system > Contents > registered .
While Yuzu doesn't strictly require firmware for every title, it is highly recommended for full compatibility. Without it, several major games may crash at the main menu or fail to boot. The firmware contains system files (such as fonts and sound assets) that the emulator uses to mimic a real console environment. yuzu emulator firmware download github
Ensure your firmware version matches your encryption keys (prod.keys) to avoid compatibility errors. Go to nand > system > Contents > registered