I'm so sorry if this has already been answered, but I can't for the life of me get the aio cia working. (I am on the 8/03/15 nightly) I put the retroarch folder in the root directory (just the one in the 7z) and black screen. If I pressed B, it would reboot my system. Then I tried putting the 7z's root in the directory (folder structure: sd://retroarch/retroarch and sd://retroarch/cias) it would give me another black screen, however pressing B did not reboot it. When I put the SD card back in my pc, I noticed it made a "retroarch.cfg" file. I tried changing the only entry to libretro_path = "retroarch/retroarch" and now I get an instant system crash when I try to launch the CIA. Then I tried changing it to libretro_path = "sd://retroarch/retroarch", and no change. I did some research, and found that that flag is used to have it automatically launch a core, but I don't know which core to launch. So yeah, I'm stumped, and feel silly.