I want to upgrade my psp to 2.0. I have used wab version changer to change to 2.0, but I have already reverted it back to 1.5 like the other posts say. The problem is, when I try to upgrade to 2.0 from an eboot on my mem stick, i get a "game could not be started" error, and when I try to upgrade from a UMD, it actually takes me to the upgrade screen, but there is no text and the upgrade will not work. :(