The most common way to "cheat" is to download a completed save file that includes maxed-out currency or fully unlocked features.
Unlike older games where you input button codes, FIFA 12 on PSP uses an in-game store system. You purchase unlockables using "FIFA Points" or "Coins" earned by playing matches.
through regular play, gamers could unlock "Cheat" items such as: Maximum Stamina:
For those using the standard retail version, here are the button sequences that actually work on the (No mods required).