in november 2008, i have update my psp firmware psp to 5.0m33 from 4.0-m33-3
to update firmware we need
1. Original PSP Firmware. you need to rename it.
2. Dark alex Firmware rename it to EBOOT.PBP
you must run dark alex firmware and automatically the program will read the original firmware and make some change. so it can play ISO game..
1. make sure your batere is full.
You need to restart the PSP after the update succsess.
Then I check the compability.. (just game / application that i have.)
In this fimware 5.0 m33.
there are something new feature like
1. sleep time for media player
2. Querty inpud..
3. PSP shopping menu (you still need internet connection via WiFi)