First off RGH has nothing to do with ps3 so maybe thats why.
Rgh is for Xbox. Ps3 Jailbreak is like a RGh.

A RGH is a xbox and CFG is a infection. You can download the files off youtube then get into someone's game who has cfg leave go split screen and you will have your own Mod menu.

A CFG is configuration files for the game such as Modern Warfare 2. It's technically a mod menu for people with a jailbreak & yes it's for PS3, not Xbox. You can have access to many different mods like Super Jump, Explosive Bullets & all of that kind of stuff. You just need to be host. So CFG is technically a mod menu but you don't need a jailbreak to use it. You just need a Ps3, USB, and the CFG! Hope this helped!

just look it up on U-tube and also look up tutorial on how to get and use a CFG for ps3 (Mw2 mod menu)
its very fun and for a good mod menu suggestion, i use Firelight V10 i think its the best in my opinion.
Happy Modding