so the sdk is not the problem, nor the ps3 settings. i dumped killzone 2, edited the debug eboot.bin, replaced it and this game works fine!!
so its not the sdk or the ps3 settings. i think its the eboot.bin from the other games, that don't work. if someone is interested i can upload the resi5.elf for example, maybe someone has an idea or a solution. i'm willing to buy a bd-recoder but first i want games to work.
resi 5: not working
heavy rain: not working
god of war 3: not working
killzone 2: works!
you see the games that don't work are all new! so maybe this method only works on old games?
well, I would try booting from dev_bdvd or dev_USB0 to see if it works, if you have access to the bd image generator.