I don't think the BD mirror setting applies to HEN, I could be wrong though. Going by that would mean your game is currently in "Folder Format" so to get it to work and get the best compatibility you should use PS3 ISO Tools or a similar program to convert it to an actual "ISO". PS3 ISO Tools lets you pick either genps3iso or makeps3iso. You want to go with makeps3iso for the best compatibility. Last of Us is a big game, so make sure you have the space needed.