My CFW's 5.00 m33-6 (with no add-ons of any kind like Prometheus etc) but even with zero compression it crashes for me at the Monastery. I'm thinking it's mostly a firmware problem but I don't know which firmware version works. 3.30, 3.71 hard crashes my psp and forces it to reboot while 4.01 and original flash just soft-freezes (I can use the Home button to go back to the menu) instead.