Trainer options
F1 - Infinite Stats
F2 - Infinite Jet Pack
F3 - Infinite Ammo
F4 - Infinite Consumable Items
F5 - Infinite Quickbar Items

Notice:

First start game world then activate jet back cheat.

First shoot your weapon once then activate the ammo cheat then shoot again and ammo will be set 999.

First use a consumale item like a water bottle once then activate the cheat and consume an item again and it will get set to 999.