Using this Trainer:
Launch the trainer first, then launch the Game and then Press F1 at the Main Menu.
Listen for "Activated".
Press desired option key
Options in Promo:
Numpad 7: Reset Hits Taken
Numpad 1: Unlimited Health
Numpad 2: Unlimited Ammo/Items
Numpad 3: No Reload
Numpad 4: Unlimited Silencer
Numpad 5: Improved Accuracy
Numpad 6: Easy Kills
Numpad 7: Reset Hits Taken
Numpad 8: Midnight/Dawn/Noon/Dusk
Numpad 9: Heroism
Numpad 0: Add GMP
Numpad *: Massive/No Materials
F1: Stealth Mode
F2: Enemies Cant Attack
F3: Mega Unlocker
F4: Evil Level
F5: Rapid Development
Keep in mind that some of these options may not work or may not be useful until you have escaped the Hospital and are in the main part of the game where you are performing missions and etc.
Numpad 1: Unlimited Health - toggle on and most things cannot kill you.
Numpad 2: Unlimited Ammo/Items - toggle on and most ammo and many items such as grenades are unlimited.
Numpad 3: No Reload - toggle on and many weapons when fired will not need to reload the clip.
Numpad 4: Unlimited Silencer - toggle on and many weapons with silencers will never run out of the ability to use the silencer.
Numpad 5: Improved Accuracy - toggle on and most weapons have better accuracy when firing and when moving.
Numpad 6: Easy Kills - toggle on and some enemies are killed quite quickly. Some enemies have armor or other abilities that require you to kill them in a certain way. This has been improved to kill some enemies that use Shields and Armor!
Numpad 7: Reset Hits Taken - this resets the Hits Taken amount during the game when you are shot.
Numpad 8: Midnight/Dawn/Noon/Dusk - each press toggles to a new time of day.
Numpad 9: Heroism - you must first enter the PDA to note your values and then press this key to add more.
Numpad 0: Add GMP - you must first enter the PDA to note your values and then press this key to add more.
Numpad *: Massive/No Materials - toggle this on and when you enter the Mother Base and look at certain resources or try to craft weapons and items you will see that many materials you have plenty of them, even some that you have not collected yet. UPDATED! This option now has three settings, 1) Massive materials 2) No materials and 3) Back Off. To use, press the option key and the first time you hear ACTIVATED, the massive materials is ON. Press again and the next ACTIVATED you hear the materials will be set to zero. Press the option again and you hear DEACTIVATED and the option is off.
F1: Stealth Mode - toggle this on and most rank and file human enemies cannot see you. They may hear you but will not be able to see you nor will this set off the flag that you have been seen. You can walk right up to most of them and cap them or knock them out, even in front of others.
F2: Enemies Cant Attack - DO NOT LEAVE THIS OPTION ON ALL THE TIME! This powerful option basically removes the AI engine while it's on. This means that enemies that haven't seen you (and many that already have) cannot attack you. Many of them won't react to you at all. Most of them can be shot as well. Keep in mind that this removes the ability to interact with many AI while it is on. So if you are trying to loot something, interact with something, and etc. then you need to turn this option back on. Also, calling in the chopper and some scripted events are on pause while this is on. The best use of this is to turn it on when you see enemies, sneak past them, and then turn it back off when you need to do something or interact with something. Note that this will actually work with most of the non-human or specialized units as well, whereas the stealth option may not work for these rare units in the game. Leave this off unless necessary, although the option is perfectly safe to use.
F3: Mega Unlocker - This powerful option makes it possible to purchase items, weapons, upgrades from the DEVELOPMENT section of the MOTHER BASE. To use this, toggle the option on while in PDA mode or between missions where you can Access the PDA and select the MOTHER BASE tab. Toggle the option on and then click the DEVELOPMENT menu item. You can then select most items in the WEAPONS, BUDDY, and HELICOPTER sections and then click on the item to DEVELOP it, even if you do not have the required resources, GMP, blueprints, or Team Lv value. Some items still take several minutes to complete, and some items will still subtract your GMP amount (into the negative, lol!), but you can unlock almost everything this way so that you can use them in the game. Turn the option off when not needed.
F4: Evil Level - This option has SIX levels. To use this, first, be on the helicopter and NOT at the mother base. Next, activate this option. When you hear "Trainer Activated", that means your Evil level is set to the lowest. Each press afterwards adds more Evil up to six levels. When you hear "deactivated", the Trainer is deactivated. The levels are REMOVE EVIL, EVIL 1, EVIL 2, EVIL 3, EVIL 4, MAX EVIL. So to achieve MAX EVIL, you would do the following: Get on helicopter. Press F4 until you hear "TRAINER ACTIVATED", then press F4 five more times. Then you need to go to the mother base. When you arrive at the Mother Base, you will be at the MAX EVIL. Then press F4 until you hear "Deactivated" once you arrive at the base.
To remove all evil, Press F4 until you hear "TRAINER ACTIVATED", then go to the Mother Base. When you arrive at the Mother Base, you will have the removed the evil. Remember to press F4 until you hear "Deactivated" once you arrive at the base.
Again, the levels and sounds for F4 option are:
"Trainer Activated" REMOVE EVIL
"Activated" Evil 1
"Activated" Evil 2
"Activated" Evil 3
"Activated" Evil 4
"Activated" MAX EVIL
"Trainer Deactivated" Turns the option OFF
And summary to use it, press F4 until you are at the proper evil level, go to the mother base, press F4 until you hear "Trainer Deactivated". The level is set.
F5: Rapid Development - Toggle this on and when you start development of many weapons, they will complete very quickly. This might work with other things that are developed at the mother base as well but was tested working with many weapons.
Unlock more trainer options including updates from here - MGS V: The Phantom Pain Trainer