: The file will appear in 0:/gm9/out/ (root of SD card, inside the gm9/out folder).
Always dump your own.
When an SD card's operating system file structure becomes corrupted, tools like the Hacks Guide Wiki Rebuild Title Database script require the boot9.bin binary alongside your console-unique movable.sed to successfully parse and repair internal storage tables. How to Dump Boot9.bin From Your 3DS Boot9.bin 3ds