Even after placing the file, you might run into common hurdles. Here is how to fix them quickly: Error: "Master Key Missing" or "Old Key Generation"
system data. To create a valid file, you generally have two options: Option 1: Extract from your console (Recommended) : Use a tool like Lockpick_RCM on your modded Switch to dump your system's . Once dumped, rename this file to and move it to the directory within your NSC_Builder folder. Option 2: Use the Template : Open the existing keys_template.txt
Modify the metadata of a new game so it can be installed on an older custom firmware (CFW) version, bypassing strict system update requirements. Why Does NSC Builder Require keys.txt?
: Used to verify and decrypt the headers of XCI and NSP files. nsc builder keys.txt
Compress large NSP/XCI files into space-saving NSZ/XCZ formats.
You are trying to process a brand-new Switch game or update that requires a newer Master Key than what is present in your text file. This happens if you dumped your keys when your console was on an older firmware version.
Some users prefer to explicitly populate the keys_template.txt file. This can be a good practice for clarity, especially if you are troubleshooting. Even after placing the file, you might run
Start the NSCB.bat (batch file) to open the application. Troubleshooting keys.txt Issues
Even with a keys.txt present, users frequently encounter issues. Here is how to debug them:
Put your Switch into Recovery Mode (RCM) using a JIG or modchip setup. Once dumped, rename this file to and move
Error using NSC Builder when merging files : r/EmulationOnAndroid
Locate the subfolder named (in some versions, it can also be placed directly in the root directory alongside NSCB.bat ).
To integrate the keys into NSC Builder, you must typically follow these steps: