FBI works very good on emunand for both games and updates/dlc I can say at least for myself.For some reason I was able to install FBI.cia onto EMUNAND 10.3 via HBL and NASA app https://gbatemp.net/threads/release-nasa-cia-manager-for-fw-9-3.409806/
Will test the FBI further to see whether it fully works. Just want to report in case someone can better test. This would solve a lot of problem getting CIA installer on EMUNAND.