for the unlocks, you have about ONE SECOND after you activate the option to open the next screen window. If you take too long then the option resets. this is because the game actively scans for game manipulation. our options on this game cannot take more than about a second to be 'active'.
so again, press the key and then quickly enter the next window (i.e. weapons or custom upgrade screen)
likely if the option doesn't appear to be working, you are being too slow.
don't blame me for this.. it's because of the stupid anti-cheat, anti-game modification code the developers put into these games..