If you already have the key strings, you can simply create a new text document, paste the keys inside, and save it exactly as aes_keys.txt Where to Place the aes_keys.txt File
file acts as a "keyring" that Citra uses to decrypt the game data in real-time as you play. How to Get Your AES Keys
To play encrypted 3DS games on Citra, you need a file named containing the necessary decryption keys. Because these keys are copyrighted by Nintendo, they cannot be legally distributed online, and you must officially dump them from your own 3DS hardware. 1. How to Generate the Keys
: Close and reopen Citra after adding the file for the changes to take effect.
: Connect your SD card to your computer and locate the file in the Format Check : Ensure the filename is exactly aes_keys.txt (all lowercase). Restart Citra
: Ensure your 3DS is running custom firmware (Luma3DS) and has GodMode9 installed.