The most official and legal way to obtain these keys is to dump them from your own Nintendo 3DS hardware.
A: No. boot9.bin is the 3DS’s bootrom — much more sensitive. Never share that. aes_keys.txt is derived from it but less dangerous to possess. Still, treat it as private. citra aes keystxt download top
Citra is a high-performance 3DS emulator, but it does not come packaged with the proprietary Nintendo software required to decrypt games. Most 3DS games (ROMs) are encrypted to prevent piracy. The most official and legal way to obtain