I installed Hermes CFW 3.41 on my PS3, model CECH2000A (120GB) and it works fine. I use Hermes Payload v4b and tested the following games Uncharted 2, Call of Duty Black Ops, Fall Out New Vegas, FIFA 2011, Heavenly Sword, Heavy Rain, Killzone 2, Ratachet&Clank: Quest for Booty, Red Dead Redemption, Resistance 2 and they all worked.
Still, when I try to play GT5, US and EU versions, or Little Big Planet 2, I get black screens.
Anyone had the same problem and got a solution? Thanks and keep up the good work!