The Heist

M12: The Heist is a main mission in Deus Ex: Mankind Divided, and takes place during your second visit to Prague. This mission and M11: Confronting the Bomb-Maker cannot both be completed during a single playthrough as you need to choose between them.

Get to the bank
Once you have chosen to infiltrate the bank rather than save the bomb maker, Alex Vega will direct you to the Palisade Property Bank car park where Janus has left a package for Adam to collect. Travel to the bank in the Čistá district.

Retrieve Vega's package
Palisade's parking lot is considered a restricted area, so it is probably best to get the package unseen. There are a number of ways in. One is to remote hack the shutters that are blocking the vehicle entrance. If the guards notice the door opening, they will become suspicious. You can also hack the door beside it, or move the rubbish bin next to the door to reveal a weakened wall that can be punched through. It is also possible to enter through the basement of the nearby Ludvik's Lounge by hacking the locked door and going through the vent. Here there is a door that leads into the parking lot.

The package is in the trunk of a blue car in the right hand corner of the lot. In it, there will be a blank keycard for Palisade's corporate vaults, and a datastick belonging to Janus that they can use to store the information they need. In order to access the vaults, Jensen needs to validate the keycard with the biometrics of an authorized VersaLife representative. To do this, you must go the CEO's office on level 3 of Palisade.

Access a restricted terminal
There are multiple ways into Palisade proper, but the most straightforward one is through the front door. Once you are in, you will need to make your way to the next level up, where the CEO's office is located. If you have previously completed the mission Samizdat, and agreed to find information on Picus, this next objective will be familiar. As with the parking lot, there are multiple ways to get to the restricted level 3. The easiest way is to look for an elevator keycard that allows you to visit the restricted floor. One of these cards can be found in the Account Mangers office in the lobby area. You will need to hack the door without being seen, or alternatively use a multi-tool. Walk behind the boardroom on this same level and use the elevator to go up. The office you are looking for will be directly to your left when you arrive. There should only be one guard in this room, and is easy to avoid. Go up the stairs towards the office and hack the door or use the code 0211.

On the CEO's desk (the right one), there is a biometric terminal beside the computer. Interact with this to create a valid VersaLife keycard to access the vault. Before leaving the office, you may want to access the hidden area if you have not done so already. This opens up an alternate route to the next objective. To get into the area, you need to solve the block puzzle in the office. To do so, interact with it in this order: raise, turn, raise, turn, turn, raise. The area should now be unlocked. Alternatively, sneak back down to level 2 using the elevator, or an alternative route if you prefer.

Use the corporate vault elevator
To get to the vaults, you need to bypass the guard and laser grid at the far end of the lobby area. The elevator to the corporate vaults is just behind this. If you have the Glass-Shield Cloaking System, you can activate it and sneak through the lasers and onto the elevator. If you chose to access the secret room in the CEO's office, simply go through the vent and it will lead you directly to the elevator.