This question is coming up a lot recently; 3.03 OE is a custom firmware by Dark_AleX.
It combines the features of 3.03 with the homebrew of 1.50 and ISO loading.
More info:
http://www.psp-spot.com/forums/index.php?s...st&p=200566You can easily downgrade any to 1.50 again if you want to.
I'm not sure if you can run CheatDevice for GTA: VCS, but I think you can run CWCheat, not sure though (I never cheat).