Crysis 2 cheat mode

I cannot make any sense of the various "cheat mode" help items on various web sites. It says to enter the console by pressing tilde key which I do and then enter Con_restricted 0 or =0..neither work. I am a novice in doing this sort of hack. Can anyone talk me through what to do in easy stages as I want to set up god mode to have a quick look through the game. Is there a config file somewhere that need altering ?