Before diving into the keys file, it is essential to understand the parent program. NSC Builder is a GUI (Graphical User Interface) front-end for several command-line Switch tools. It is primarily used for:
: If the tool gives decryption errors, your keys.txt likely comes from an older firmware than the game requires. You must re-dump your keys after updating your console. nsc builder keys.txt
Since distributing keys is illegal, you must create your own keys.txt file using tools running on your own Switch (which must already be running custom firmware like Atmosphere). Before diving into the keys file, it is
If you cannot obtain a keys.txt via Lockpick_RCM, or if NSC Builder is not meeting your needs, consider these alternatives that also rely on key files: You must re-dump your keys after updating your console
This is the most sensitive topic. Legitimate keys are unique to your own Nintendo Switch console. Here is the (assuming you own your console and are operating under fair use/backup laws in your jurisdiction):
For basic cleaning or patching a single file.