Despite automation, aes_keys.txt remains supported as a legacy fallback. If Citra cannot find keys via boot9.bin , it will check the sysdata folder for the text file. This ensures that older setups or "portable" installations lacking a full BIOS dump can still function if the text file is present.

Ensure your CPU supports SSE4.1 and you have OpenGL 3.3 support. If you'd like, I can: Show you where to download the aes_keys.txt file Explain how to dump your own keys from a 3DS

In a portable setup, the file structure is specific. You cannot just drop the file into the main folder; it must go into the system data subdirectory. Portable Path: [Your Citra Folder]/user/sysdata/aes_keys.txt folder doesn't exist inside your folder, simply create it manually. How to Get Your Keys

For the emulator to recognize the keys in a portable setup, the file must be placed in a specific sub-directory: Navigate to your Citra portable folder. Navigate to (or create) the [Portable Citra Folder]/user/sysdata/ Place your aes_keys.txt file directly into this Troubleshooting Common Issues CITRA: bios support for AES Keys · Issue #270 - GitHub

: To make Citra "portable" (running entirely from a single folder, such as on a USB drive), you must create a folder named user inside the same directory as the Citra executable ( citra-qt.exe ).