It contains the "keys to the kingdom"—the static cryptographic keys hardcoded by Nintendo to protect the console's security.
The file is typically "dumped" from a console already running custom firmware. Common methods include: boot9bin file
The filename boot9bin is commonly used by homebrew tools like boot9strap and GodMode9 to refer to the dumped BootROM image. It contains the "keys to the kingdom"—the static
The boot9bin file is a 1 MB binary file, containing a mix of ARM9 and ARM11 code, which are executed by the respective processors in the 3DS. When the console is booted, the boot9bin file is loaded into the ARM9's memory, and execution begins. The file is divided into several sections, each responsible for a specific task: each responsible for a specific task:
