: %USERPROFILE%\.switch\prod.keys (typically C:\Users\YourName\.switch\prod.keys ). Linux/macOS : $HOME/.switch/prod.keys .

Hactool is a powerful command-line utility, but it’s notoriously picky about where it looks for its "dictionary" of keys. Here is a review and troubleshooting guide to help you resolve this. Why This Happens

Prodkeys are cryptographic keys used by the Nintendo Switch to verify the authenticity of games and other content. These keys are generated by Nintendo and are used to sign and verify the integrity of game data. Prodkeys are essential for ensuring that games and other content on the Switch are genuine and have not been tampered with.