[Help] 5.50 Prometheus

[pok21]

OK im starting to have serious problems with this.

First of all i need to know which is the latest version because Ive see v6,pro-2,and many more.

Second, how do you REALLY make it work (and i don't mean:"put in GAME, run, and hit 2 X"), like settings or anything else? Because my main problem is that it doesn't work at all. In my system info it says "5.50 Prometheus", but when i go and start a game like the new POP it shows the error "Game can not be started".

I know that some of you might say: "why don't you try patching you games with UMDGEN or isotool or even use KHBBS", well the problem with then is that 2 of them don't work and one is not convenient for me:
-with UMDGEN and the prometheus files i get an error that some EBOOT is already in use
-with isotool i see the is, i press eboot decrypt, hit YES on all 3 questions, exit and when i go and test the game, again the same problem "Game can not be started"
-with KHBBS (which in currently using) im having trouble using cheat devises, and i get in the position: use cheats but not on new games or dont use but play them

Ive also tried reinstalling countless times (more then 8 times so far), because if none of the above works then it must be the f0, but no.Ive also tried all sorts of different combination of settings: CPU, drive,region,plugin ON/OFF.., but without any success.

My psp is a FAT (so there SHOULDN'T be any problems with it) and is currently on 5.50gen-D3

Thx in advance for all the help, sorry for the long post.Any help would be greatly appreciated.

PS: OK found out whats the problem. I was playing CSOs but they had to be in their original ISO format.
Mods please close thread.