PSP 2000 with 5.50 Prome-4 and a lot of games don't start at all. I've tried starting games like Tactics Ogre, Lunar, Phantasy Star P 2, TITS and nothing worked. Games like FFCC and Mana Khemia does work however. With Prome-4 should I get untouched games even if they are newer ones or do they need to be patched? Upgrade to newer firmware perhaps? I'd rather not..