Modern 3DS hacking centers around an exploit called . This is a custom bootloader that exploits a vulnerability in Nintendo’s BootROM to gain full, unrecoverable control over the console before the operating system even loads.

Unlike movable.sed (which is console-unique), boot9.bin is identical across all 3DS, 2DS, and New 3DS models.

: It is a critical file for unbricking or restoring a console's NAND, alongside other files like movable.sed Custom Installation : Tools like custom-install

Finally took the plunge and dumped boot9.bin from my Old 3DS today. For those who don't know, boot9.bin is a 100% console-unique dump of the BootROM (specifically the secure bootloader, Boot9) that runs the first time you power on the device.