If you are trying to decompress or convert newer games, your keys must be dumped from a Switch running a firmware version equal to or higher than the game's requirement.

If you are for a legitimate technical purpose (e.g., your own hardware, authorized development), you would:

The tool specifically looks for files named prod.keys or keys.dat . Some users have found success by simply renaming their prod.keys to keys.dat if one doesn't work.

If you are using to manage your game files—converting NSZ to NSP, extracting firmware, or patching files—you have likely encountered the error: "Are the keys.dat/prod.keys correct?" .

: For Switch Army Knife to function, you must place these files in the /bin/ folder of the SAK directory. Many users find that simply renaming a valid prod.keys file to keys.dat (or vice versa) resolves "missing file" errors. 2. How to Obtain "Correct" Keys