To resolve the "[WARN] prod.keys does not exist" error in hactool, you need to place your keyset file in the default directory for your operating system or manually specify its path. Default Key Locations
Ensure the file is a plain text file. Each line should look like: key_name = 32_digit_hexadecimal_value ⚠️ Common Troubleshooting Still getting the warning Double-check that the file extension is (Windows often hides known extensions). "Failed to match key"
You are trying to decrypt a newer game (e.g., Firmware 19.0+) with old keys. Improper Extraction:
The only verified and legal way to obtain your prod.keys is to dump them from your own Nintendo Switch console using a homebrew tool called Lockpick_RCM.