MasterQ no problem cwcheat doesn't apply cheats when the wlan switch is up so it's impossible (without modifying the prx) to cheat online
it was done for this purpose
gameshark: what do you mean? to enable cheats you need:
1- load a game which is in the database (you will see the game name in the menu)
2-go to select cheats and enable the cheats you want
3-press x over apply cheats
4-make sure the wlan switch is off
5-wait 1-10 seconds depending of the cheat delay option or press on manual cheat apply (still with wlan down)