File - Boot9.bin

In the digital world, this was a ghost. Nintendo had designed the 3DS so that this code would vanish from memory the millisecond the system finished booting. It was a phantom that disappeared before the OS even started. But thanks to a decade of community effort and a tiny flaw in the hardware’s armor, Elias could finally see it.

The resulting dump is almost always named boot9.bin . This file is typically in size (depending on the 3DS model) and consists of encrypted, obfuscated machine code. boot9.bin file

For years, Nintendo's write-protect security successfully kept the Boot ROM keys hidden. However, hackers eventually discovered a flaw in how Boot9 verified signatures. This vulnerability, known as , allowed developers to trick the Boot ROM into running unauthorized code before the security lockdown occurred. In the digital world, this was a ghost

In most jurisdictions (including the US under the DMCA and the EU under the InfoSoc Directive), downloading a boot9.bin file from the internet is illegal . Nintendo holds a copyright on the binary code embedded in the boot ROM. Distributing that code without permission is copyright infringement, regardless of its size (it’s typically 16KB to 32KB). But thanks to a decade of community effort

Select boot9.bin and copy it to the SD card (typically to /gm9/out ).

Because the code is burned into the hardware, any vulnerability found in it is permanent . Nintendo cannot "patch" boot9.bin with a software update.

Crucially, you cannot legally or practically download boot9.bin from the internet. It is console-specific? While the code is identical across all 3DS, 2DS, and New 3DS consoles (per region/revision), the BootROM itself is read-protected.