(often paired with boot11.bin ) is the dumped ARM9 Secure BootROM of the Nintendo 3DS. It represents the "Holy Grail" of 3DS hacking because it contains the absolute first code executed by the system's processor upon powering on, along with the hardware-level encryption keys used to secure the entire platform. Technical Significance The Root of Trust
Select Files: Highlight boot9.bin. You can also select otp.mem at the same time by pressing (L) on both. Boot9.bin 3ds
Solution: Luma updates never delete boot9.bin. It is stored in a protected NAND region or on SD root. Check sd:/boot9.bin and sd:/gm9/out/. If truly gone, re-dump it using GodMode9 as described above. (often paired with boot11
Ethical and legal considerations
A massive point of confusion for new users is the difference between Boot9 (the hardware) and boot9strap (the software exploit). Boot9 (Hardware): The immutable BootROM inside the CPU
Security Backup: It is part of the "essential files" needed to recover a console from certain types of bricks.
Near-Unbrickable Systems: Because Boot9Strap installs itself at the very beginning of the boot process, users can often access recovery tools even if the operating system (the NAND) is completely corrupted.