um i could possibly help you out, first off i dont know if you want the newest firmware yet, cuz i heard it becomes a problem with a lot of people ,like some emulators wont work etc...but the way i can help you is, i can share the 4.01 m33-2 cfw file with you, it runs pretty much everything, ill even share all the stuff i have so far
rockband.iso
iphone
halo for psp, its user made
counterstrike for psp daedalusx64 emulator
jnester
get back to me
You need to update to 4.01 then you can go to 5.00m33-6, this is the latest M33 software and has no issues, if you want to go to the PSN then you will need 5.50Gen-B, however this does have some issues, 5.00M33 runs most games (currently 6 games need 5.55 which is not available)
"ill even share all the stuff i have so far
rockband.iso
iphone
halo for psp, its user made
counterstrike for psp daedalusx64 emulator
jnester
get back to me "