You need the agb firmware with the rest of your firmware files in the aurei folder and gba titles runnin off emunand must also be installed on sysnand.
It doesnt need firmware files anymore. He hasnt patched the AuReinand.bin location into the bin itself using the patcher.exe from the github. I didnt know where it was so i got it downloaded from a forum. I feel im just stupid and cant see it in the github.
If youre using the old AuReinand 4.2.7 it will work with the firmware patches for agb and twl. But if its the new 5.0 it wont. You need to patch the hardcoded location thats on the sd card. Say mine is \a9lh\AuReinand.bin. So you need to use the patched and select that. So use the directory yours is in instead of mine unless its the same.