: Prod.keys are general system keys used for decryption, while title.keys are often specific to individual games. For most modern emulators, both are required to be placed in a designated keys folder.
If you try using old prod keys with a game released after your keys’ firmware version, you’ll likely get a or “decryption failed” error.
Last updated: June 2026
“The old keys are dead,” the client had pleaded over a staticky voice call. “We have the source code, the assets, everything but the handshake. Can you forge a new set of production keys from scratch?”
You must have a Switch running Custom Firmware (CFW).
: Nintendo’s 2024–2025 legal actions against emulators like Yuzu emphasized that using prod.keys to circumvent software protection violates the Digital Millennium Copyright Act (DMCA) in the United States.