I know what ISO is but what is CSO. Also i downloaded an ISO or what it seemed to be, ANd when I open the folder using Winrar, there was at least 6 other folders in there. I found this one folder inside one of the other ones and there was PSP_GAME and UMD_DATA.BIN. I dont think that, that is an ISO. How can I make it into an ISO. I have cfw 3.03oe-c and fastloader v.7.