Some users found that simply renaming updates64.txt (if present in the ZIP) to prod.keys and placing it in the bin folder fixed the "missing" error for the interface. Common Troubleshooting Tips
To ensure your keys are "correct" for 2021 firmware (which reached version 13.x.x that year), you must ensure they match the firmware of the game files you are trying to process. sak are the keysdat prodkeys correct 2021