Press the button, select Scripts , and run the DumpKeys script.
Accessing features like Mii sharing, StreetPass data, and system-level font rendering.
Once you have the file, it must be moved to the folder in your Citra User Directory. The location varies by operating system: 3DS trying to get AES keys : r/Roms
Boot your 3DS into GodMode9 (usually by holding while powering on).