How do you do infinite ammo cheat in Halo 2?

In Halo 2, to enable the infinite ammo cheat, you need to use the game’s debug menu. First, you must complete the game on any difficulty to unlock the cheat options. Then, on the main menu, press and hold the following buttons: L Trigger, R Trigger, and the Back button. This will activate the infinite ammo cheat, allowing you to fire weapons without running out of ammunition.