Gonna add my 2 cents here as well. As others said the health, armor and ammo dont work. I have no idea what the FC are so that could use some explanation.
But the worst part for me is that I keep getting Game Over message. Its as if I suddenly just got instakilled for no reason at all.
I didnt start using the trainer before the area where I got the Cannon. What happens is I start fighting, then after a minute or 2 I just get a black screen and the message saying Game Over and that I can load from previous save. It happens randomly, even if I have not taken a single hit.