Once you've destroyed all three signal jammers around the city, Jamal will send you the location of the Merryweather lockup housing the bypass module.
The lockup is heavily guarded. You will also find an armored vehicle with a mounted machine gun. Take cover and eliminate all the enemies.
Do not destroy the armored vehicle outside the lockup, as we will use it for cover against the enemies inside the lockup.
After eliminating everyone outside the lockup, destroy the control panel by the lockup shutter door.
The shutter door will open, and while it is opening up, quickly take cover by the armored vehicle.
There is a heavily armored juggernaut with a death machine inside and some more Merryweather guards.
The easiest way to take out this juggernaut is by using explosives. Use an RPG, a sticky grenade, or even a grenade launcher.
But the problem with the death machine is that you're also exposed to the enemy firing you with theirs. And we all know the death machines can really deplete your health bar (The Doomsday Heist flashbacks).
Once you've taken out all the enemies, head inside the lockup and pick up the bypass module.
Deliver the bypass module to the salvage yard to complete this mission.
Planning Work 2: VIP Pass
In this mission, you need to acquire the VIP pass. You get it by breaking into the abandoned workshop of the Maze Bank Arena.
When you get to the workshop, sneak your way into the two ground floor offices to find a keycard to Peter's office.
The keycard can spawn randomly in any of the ground floor offices, and it is not fixed which one gets the keycard. It is random every time you get this mission.
First, make your way to the middle by going over the railing to your left and down the small slope. You cannot jump over it, so you must walk around. Be careful of the security camera's cones of vision and proceed to the office on the left.
When you get to the office, hack its keypad.
When you enter the office, you can usually expect the keycard to be on the work counter or the office desk.
Now we move to the next office. Both the offices are next to each other, side by side. However, to get to the office on the right, you will have to circle back and, go through the middle and walk up the little slope. This is because there is another security camera between both offices.
Hack the keypad of this office and check inside.
After acquiring Peter's office keycard, you must go to his office.
Also, be careful of the camera facing the stairs leading up to Peter's office.
The VIP pass inside Peter's office is also in a random location, sometimes on the table, on the shelf, and sometimes on the TV stand.
When you pick up the VIP Pass, some guards will enter the workshop and try to take you down.
You don't have to fight them as you can quickly leave the office, go downstairs, and leave the workshop.
Once you're out, get in your vehicle and deliver the VIP pass to the Salvage Yard to complete this mission.
Planning Work 3: Disrupt Armor (Optional)
This is an optional mission, and you can skip it and go straight to the robbery if you'd like. But if you complete this mission, it will help you a lot during the final robbery.
Completing this mission will reduce the number of guards equipped with body armor inside the Maze Bank Arena during the robbery. Since you will get into a gunfight, it is be beneficial to do this optional mission.
You only get 10 minutes to complete the mission, so we recommend using a Buzzard or an Oppressor Mark II.
First, you need to make your way to the Duggans' lockup, where you will find the first shipment. You will find two Duggan guards outside the lockup.
You will find three more guards inside the lockup.
After taking them out, use explosives to destroy the armor shipment. You can use any type of explosives, such as a sticky bomb, a grenade launcher, or even an RPG (given you're at a safe distance).
Once destroyed, you need to look for a black folder (it can also be a clipboard, depending on what lockup location you get) that gives you the list of the remaining armor shipments and their locations. The folder is in a random place inside this lockup.
After reading the list, exit the lockup, fly to these armor shipments, and destroy them.
Once you've destroyed the remaining three shipments, your mission is complete.
With all planning work complete, you are now fully prepared for The Duggan Robbery finale.