NSCB supports both manual and automatic modes for batch processing:
If the nscb_keys.txt is missing or outdated, users will encounter errors such as: "Failed to decrypt NCA header." "Missing Master Key."
Ensure the file is named exactly keys.txt (check that Windows isn't hiding file extensions, which could result in a file named keys.txt.txt ). Ensure it is placed in the designated tools folder inside the NSCB directory. Nscb Keys.txt
refers to the vital cryptographic configuration file required by NSC_Builder (Nintendo Switch Cleaner and Builder) , a popular command-line tool used within the Nintendo Switch homebrew community. Without a properly configured keys.txt file placed in the application's core asset directory ( ztools ), NSC_Builder cannot decrypt, compress, modify, or pack Switch game binaries like NSP, NSZ, XCI, and XCZ files. What is NSC_Builder?
: Removing identifying information (titlerights) to make files safer for certain uses. How to Set Up the keys.txt File NSCB supports both manual and automatic modes for
: If NSCB says it can't find keys, double-check that the file is in the ztools folder, not the main root folder.
NSCB includes a keys_template.txt file inside the ztools folder. You can fill in the necessary key values manually, though this is much more tedious than using a complete prod.keys file. Without a properly configured keys
necessary for the tool to "handshake" with encrypted Nintendo Switch content. These keys allow the software to: Decrypt and Verify: Ensure the game files are legitimate and not corrupted. Repackaging: Merge multiple files (Base + Update + cap D cap L cap C ) into a single cap X cap C cap I cap N cap S cap P Firmware Downgrading:
Ensure that hidden file extensions are turned on in your operating system. Double-check that your file is named strictly keys.txt or prod.keys and does not accidentally save as keys.txt.txt .
For newer Switch models (Mariko, OLED, Lite), using lockpick_rcm.bin is essential because the .nro version may not function properly, as shown in this video 1.2.1. Using Keys with NSC_Builder