The only "official" way to get these keys is to dump them from your own console using GodMode9. Boot your 3DS into . Navigate to [S:] SYSNAND VIRTUAL . Select aeskeydb.bin . Choose AES keydb options... -> Dump for Citra .
Windows often hides file extensions by default. You might think your file is named aes_keys.txt , but it is actually named aes_keys.txt.txt . Open File Explorer. Click the View tab. Check the box for File name extensions . 3ds aeskeystxt work
Note: If the sysdata folder doesn’t exist, you must create it manually. The only "official" way to get these keys
If you have the keys and they still don’t work, check your ROM format. can play .3ds files if you have the keys. Select aeskeydb
The most common reason aes_keys.txt doesn't "work" is that it’s in the wrong folder.