Oh, i've just bought a PSP v. 2.0 and i want to downgrade it to 1.5. I make all the things like in the first post, i enter the photo menu, that program starts and then my psp go off. i wait 15 secs and i power it on. Then i go to the game menu and when i enter the update to the 1.5 version it says " The system software on your psp system is version 2.00. There is no need to update." What can i do? I have only the pro evolution soccer 5. Do i need gta liberty city ?