A "new" prod.keys file is required every time Nintendo releases a firmware update (e.g., from 18.0.0 to 19.0.0). Each firmware version introduces new key generations. If an emulator game requires firmware 19.0.0 keys but you are using keys from firmware 16.0.0, the game will not launch.
The phrase "switch prod keys" could refer to a few different things: switch prod keys new
: Users typically boot into a custom environment like Atmosphere and use a tool called Lockpick_RCM to generate the keys directly from their system hardware. A "new" prod
Mismatched tile keys or missing title.keys . Fix: Use Lockpick_RCM's "Full Dump" option, then copy both prod.keys and title.keys to the emulator folder. switch prod keys new