easy you need a jailbroken ps3 on a cfw meaning if u on dex o cex spoofred to work online example
mw2 you will need fillezilla rebugtool box look for a patch mp.ff and put in on ur dev_hddo/games/Blusxxx/usdir
same goes for cod4 bo1 eboot mw3 sprx o tool u will need ccapi a ampi get at ngu and put in in your ps3 and on ur pc connect using your ps3 ip then get a rtm tool of the game connect ready to mod you want a gsc get a injector inject the clietids o complied file in pre gae den you hv a menu any more questions get a bat and beet the fout your ps3