The only legal way to obtain keys.txt is to dump the keys from your own Nintendo Switch console. This requires a Switch that is vulnerable to the "fusee-gelee" exploit (or other entry points) and a PC. Tools like are standard for dumping these keys from the console's firmware.
: The keys.txt file is corrupt or contains non-hexadecimal characters. Fix : Open the file and look for stray spaces, line breaks, or invisible Unicode characters. Save the file as ANSI or UTF-8 without BOM. nsc builder keys.txt
Most versions include a keys_template.txt in that folder. You can fill it out or simply overwrite it with your own file. 2. How to Generate the Keys The only legal way to obtain keys