For some reason my PS3's Multiman aint reading some of the games in my disc(eg: COD:MW3, LEGO, VIKING, ssasins Creed, Resistance) ANy idea why this happenin. All these games are ps3 games downloaded from romsfun
Or place the PS3ISO in the PS3ISO folder, that works, too, and run via Irisman or etc.Unpack the .iso file from the zip.
Put it on your external hard drive in the PS3ISO folder in the root.
Install ManaGunz from here
https://store.brewology.com/ahomebrew.php?brewid=284#google_vignette
Start the app and the games should show up.