New to PSP need some help with cheating

[Blackice]

I'm very lazy and i like to cheat, i know its takes the fun out of the game, but i like to get access to everything at the very start, i've got GTA and have got a copy of someone elses saved data(of the internet) it shows the completed game data under the saved data on the main menu but when i go to load in the game it will not work, i just dont have a clue :confused: , any chance of some help?

Thanks