i just put an custom xmb wave on my psp, but every time i try to reboot my psp it freezes. but i can still manage to get into recovery menu.( i am running proof of concept firmware). and i tried to reinstall the firmware (1.50). i get a black screen,can any body help me please. i also tried to use the wininstaller but i still get a black screen and my psp turns off. please help im willing to try any thing to get my psp working again.