Given the sensitivity of this file, treat it like a password manager database:
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 . nsc builder keys.txt
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The keys.txt file is a collection of encryption keys—essentially digital passwords—that the Nintendo Switch uses to protect its software. NSC Builder requires these keys to "unlock" NSP, XCI, NSZ, and XCZ files so it can perform advanced tasks like: Given the sensitivity of this file, treat it