Paste your keys.txt file directly inside the ztools directory.
master_key_00 = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX master_key_01 = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX header_key = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX aes_kbd_keygen_key = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Use code with caution.
Standard digital package format used for eShop titles, downloadable content (DLC), and software updates. nsc builder keys.txt
master_key_00 , master_key_01 , etc. (used to decrypt software tied to specific firmware versions) header_key (used to read XCI cartridge headers)
The keys.txt file acts as a digital keyring. It contains the unique encryption keys required to decrypt, read, and manipulate Nintendo Switch game files. Without these keys, NSC Builder cannot interpret the data inside an NSP or XCI file, rendering the tool unable to convert, trim, or verify games. Paste your keys
Disclaimer: This tool is intended for personal backups and homebrew use only. Modifying your Nintendo Switch may void your warranty.
These keys are —they are the digital crown jewels of the Nintendo Switch security model. master_key_00 , master_key_01 , etc
In NSC Builder, the keys.txt file acts as a critical, user-provided database of "Master Keys" and "Title Keys" located in the ztools folder to enable decryption, file format conversion, and modification of Nintendo Switch files (NSP, XCI, NSZ). Typically sourced from Lockpick_RCM , this file must be up-to-date with the firmware requirements of the game, as it allows for tasks like merging updates or lowering required system versions. For a detailed technical overview, visit GitHub julesontheroad/NSC_BUILDER/README.md at master - GitHub .
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: Compress heavy NSP files into smaller NSZ files to save storage space.
The Ultimate Guide to nsc_builder keys.txt: Setup, Configuration, and Troubleshooting