The error message "[WARN] prod.keys does not exist" in hactool is a common notification that often indicates the tool cannot locate your production keys file or is looking for a file with a different name. Key Solutions to the Error

Step 1: Obtain the prod.keys file

To fix the error, you'll need to obtain a valid prod.keys file. You can do this by:

Check the Filename: Ensure your keys file is named exactly prod.keys. Sometimes files are accidentally named prod.keys.txt; make sure "Hide extensions for known file types" is disabled in Windows File Explorer to verify this.

Linux / macOS: Place the file in: ~/.switch/prod.keys

hactool is an open-source command-line tool designed to inspect and extract various Nintendo Switch file formats, including:

File Placement: Place the prod.keys (or keys.txt) file in the same directory as the hactool.exe executable.