Perk Cheat
On the Perks screen in the info menu, Go to buy perks and hold L + R + Square for five seconds. A cheat perk will appear showing a Woo-Hoo icon, which is free. Buy that perk and launch it. You will find activate button. Click it and move your selection to left by clicking left arrrow. Then, it will become white. Hence, select any cheat you want.