Hi guys, I am really really new to this stuff,ao I had no idea on what to do. I keep getting confused of downgrading and installing custom firmware anways, my friend told me that he would instal 3.40OE-A so that I can play ISO on my memory stick. The only problem is that he kept it so secret that I don't know what is going on. I hardley used my psp and the only game I had was GTA LCS which is apparently the un-patched version. My firmware at that time was 2.54 or around there(can't remember). He gave me back my psp today and he put in 2 crappy games =.=. I didn't want these games so I decided to put my own. Is there a guide on how to put ISO into the psp so I can play that game on 3.40 OE-A firmware? Also if you have extra time, do you guys mind giving me a guide on how to upgrade to the latestcustom firmware that is comming out in the future? so I can play newer games that require that specific firmware? Lastly, What would be the difference between downgrading to 1.50 and using devhook and installing custom firmware to play ISO? THANKS a bunch!