This is usually caused by outdated keys. If you dump a brand-new game, you must re-dump your prod.keys from a Switch running the latest system firmware.
Unlike older consoles where the game was a static file, a "good feature" of Switch ROMs on Yuzu is the modular system:
Connect your SD card to your computer and transfer the files to your dedicated Yuzu ROMs folder. Crucial Requirements: Keys and Firmware
Complete Guide to Switch ROMs for Yuzu: Emulation, Formats, and Best Practices Switch Roms For Yuzu
Since the official Yuzu is gone, look for active forks or community-maintained builds. Be extremely cautious and download only from reputable sources (like official GitHub repositories) to avoid malware.
Before downloading anything, you must understand the file types. The Nintendo Switch cartridges and digital downloads use encryption. To run a game on Yuzu, you need a decrypted or loadable copy.
Required for some specific software and updates. This is usually caused by outdated keys
Compressed versions of NSP and XCI files, respectively.
The emulator will automatically scan the folder and populate your library with box art.
These keys decrypt specific game titles and their corresponding updates or DLCs. Crucial Requirements: Keys and Firmware Complete Guide to
Contains the base game game data. It can also securely house game updates and Downloadable Content (DLC) rolled into a single file if modified by the user.
In March 2024, the landscape of Nintendo Switch emulation changed forever. Nintendo of America filed a lawsuit against Tropic Haze, the developer of Yuzu, the most popular Nintendo Switch emulator. Nintendo alleged that Yuzu was "primarily designed to circumvent and play Nintendo Switch games," effectively "facilitating piracy at a colossal scale" by bypassing software encryption.