NSC Builder (Nintendo Switch Cleaner and Builder) to function correctly, it requires a file named renamed to
) containing your console's unique encryption keys. Without this file, the program cannot decrypt or process NSP and XCI game files. Where to Place the File file must be placed in the folder located within the main NSC Builder directory. How to Generate or Obtain keys.txt
The most reliable and legal method is to dump the keys directly from your own console: Use Lockpick_RCM
: This is the standard tool for dumping keys from a Nintendo Switch. Run it via a payload injector to generate a file named on your SD card. Rename the File : Once you have , rename it to exactly before moving it to the Ensure Compatibility
: If the tool fails to process newer games, it usually means your dumped keys are outdated. You must re-dump the keys after updating your console's firmware to the latest version. Common Issues "Could not load keys.txt nut error" : This typically happens if the file is missing from the folder or if the file content is improperly formatted. Corrupted ROMs
: Avoid merging files that already have updates/DLC integrated into a "SuperNSP" multiple times, as this can lead to corruption. Renaming errors
: Ensure your file explorer is not hiding extensions, or you might accidentally name the file keys.txt.txt
For detailed setup instructions, you can refer to the official NSC Builder GitHub repository or community guides on Reddit's SwitchPirates Do you need help dumping the keys nsc builder keys.txt
from your console using Lockpick_RCM, or are you looking for the specific folder structure of NSC Builder? How to Merge Secret Console Games with Updates and DLC
and if I'd like to install an update to Monster Hunter rise that update is 14 GB in size so I'm quickly going to run out of space. Ryan Retro Nintendo Switch Cleaner and Builder (NSC_Builder) - GitHub
Unlocking the Potential of NSC Builder: The "keys.txt" Essential Guide
If you’ve ever tried to manage a massive library of Switch game files, you’ve likely stumbled upon NSC Builder (Nintendo Switch Cleaner and Builder). It’s the "Swiss Army Knife" for merging base games, updates, and DLC into a single, tidy file. But there’s one hurdle every user hits: the mysterious keys.txt file.
Without this file, NSC Builder is like a car without a key—it looks great, but it isn't going anywhere. Here’s a quick blog-style breakdown of what it is and how to set it up. What is "keys.txt"?
In the world of Switch file management, your games are encrypted. To decrypt them for merging or converting (like NSP to XCI), the software needs specific "product keys" from the console. NSC Builder looks for these keys in a file specifically named keys.txt. How to Set It Up
Setting up your keys is a one-time process that saves hours of troubleshooting later. NSC Builder (Nintendo Switch Cleaner and Builder) to
Step 1: Obtain your keys. The most reliable way is to dump them directly from your own console using a tool like Lockpick_RCM. This generates a file typically named prod.keys.
Step 2: Rename the file. NSC Builder specifically looks for keys.txt. Simply rename your prod.keys file to keys.txt.
Step 3: Place it in the right folder. Move your newly renamed keys.txt into the ztools directory within your NSC Builder folder.
Note: Some versions may require you to fill out a keys_template.txt first. Why Keeping Keys Updated Matters
If you try to process a newer game (e.g., a title requiring Firmware 17.0) with keys from an older firmware (e.g., 11.0), the builder will fail. To avoid errors, always ensure you are using the latest keys dumped from a console running the most recent firmware. Pro-Tip: The Power of Multipack Mode
you can merge Switch games, updates and dlcs into a single file
To create a file for use with NSC_Builder (a tool for Nintendo Switch file processing), you need to populate it with your console's unique encryption keys. These keys are typically dumped from your own device using a tool like Lockpick_RCM Step-by-Step Creation Extract your keys Lockpick_RCM on your Nintendo Switch to dump your to your SD card (usually found in /switch/prod.keys Create the file : Open a plain text editor (like Notepad or TextEdit). Copy the content : Open your dumped Speed: Decrypting a 10GB NSP takes ~2-3 minutes
file, copy all the text, and paste it into your new text document. Save as keys.txt : Save the file exactly as : Place this file into the z_tools/bin/ folder within your NSC_Builder directory. Essential Key Requirements For NSC_Builder to function correctly, your must at minimum contain: master_key_00 through the latest version (e.g., master_key_0f header_key aes_kek_generation_source aes_key_generation_source key_area_key_application_source key_area_key_ocean_source key_area_key_system_source Important Note:
Distributing or downloading these keys online is illegal as they are copyrighted material belonging to Nintendo. You should always use keys derived from your own hardware. configuration settings within NSC_Builder once your keys are in place?
Cause: NSC Builder cannot locate the keys.txt file.
Fix: Ensure the file is in the root directory of the NSC Builder application, not inside a subfolder. Double-check the filename is exactly keys.txt (not keys.txt.txt due to Windows hiding extensions).
Even with a valid keys.txt, users encounter errors. Here is a debugging guide:
| Error Message | Likely Cause | Solution |
|---------------|---------------|----------|
| "No keys loaded" | File missing or wrong location | Place keys.txt in the exe directory |
| "Missing key: header_key" | Incomplete key dump | Re-dump keys with latest Lockpick_RCM |
| "Key generation mismatch" | Keys are from a different firmware version | Update Switch firmware and re-dump keys |
| "Cannot find key for title ID XXX" | A title-specific key is missing | Use Lockpick_RCM in "full dump" mode |
| "Invalid hex string in keys.txt" | Corrupted file or extra characters | Open in Notepad++, check for non-hex chars |
Advanced tip: Use NSC Builder’s built-in Key Checker tool (under the Tools menu) to validate your keys.txt against known good key structures.
Assuming you have a legitimate key set, NSC_Builder performs well:
header_key) will cause a "failed to decrypt NCA" error.nsc builder keys.txt is just a renamed text file. Ensure no extra spaces, UTF-8 encoding, or Windows vs. Linux line break issues.keys.txtWhile NSC Builder is popular, other Switch tools also require key files:
keys.txt similarly.keys.txt in the same directory.keys.txt file passed via command line.If you switch tools, you can often reuse the same keys.txt file.