Perfect Dark XBLA - How to unlock Invincible - Mission 4.3

Like And Subscribe!
Perfect Dark Arcade Xbox 360 edition XBLA
Mission 4.3 - Area 51 Escape
Agent
Target Time - 3:50
My Time - 3:32:76
Cheat Unlocked - Invincible
New Crown Earned - Bronze
Objectives
1. Rendezvous with CI spy
2. Locate secret hangar
3. Escape from Area 51

[@jtorres2056]

How do you activate this?
I did it but cant use it

[@alloutreaper]

Push start. Go to "help and options" then under "settings" you should have cheats