Well. This topic is rather old but didnt want to start a new thread on account for it being around the same issue. My friend still has the m33-6 and his psp keeps freezing its terrible. Before it would happen when he went into the cheat menu and stuff, or just randomly in game. But it progressed to the point where it would freeze right after turning on before hitting the psp menu.
So i was wondering whether there was a way to re-install the firmware in some way? while it was still workin for more than a minute i tried to update with a fresh download but it would not let me saying i have better or current frimware. I would prefer sticking with this but im not sure how