File | Boot9.bin

: Boot9 uses its internal cryptographic keys to decrypt the next layer of software stored on the internal NAND memory (the system firmware).

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Handles security, cryptography, and backwards compatibility (DS/DSi mode). : Boot9 uses its internal cryptographic keys to

In many jurisdictions, creating a backup of your own device's firmware for personal use falls under "fair use" or similar exceptions. The boot ROM is a functional component required for operating the device, and encryption keys themselves—typically generated by random number algorithms—are not subject to copyright protection unlike creative content. If you share with third parties, their policies apply

: This is the standard tool for dumping the BootROM. You can typically find it in the virtual memory section ( S: SYSNAND VIRTUAL fastboot3DS

With boot9.bin , advanced users can perform low-level operations on their 3DS NAND, extract system files, and manipulate encryption keys for various homebrew projects.