I've seen some games listed as only working properly on specific versions of mods/firmware (like FF Type 0), but I'm not sure which one I have. I got it used from a friend, and I'd asked him but he'd had it sitting in a box for like a year and can't remember exactly what it was. What I do know, is that it has one of the custom batteries, and that in order to launch a game I need to first run a program called Light Minimum Edition from the Memory Stick, which will then make all the games appear in the Memory Stick menu. But I'm sure there's more to it than that. How do I find out what type of mod/firmware I'm running and if needed, how do I go about updating it?