Liberty Reprimed

Liberty Reprimed is a Brotherhood of Steel main quest in Fallout 4.

Detailed walkthrough
When you talk to Proctor Ingram at the Boston Airport, she tells you she has been working on a secret project. While following her to a wall monitor, she mentions Liberty Prime, a large golem used during Capital Wasteland days. She mentions that it is almost rebuilt, but needs some final touches, such as help from Dr. Li on the power systems. Proctor Ingram asks you to speak to Dr. Li and convince her to help out.

Go to the Prydwen and talk to Dr. Li. After convincing her to help out, travel back to Proctor Ingram at the Boston Airport, where she and Dr. Li are hard at work. Proctor Ingram tells you that she needs you to get a high-powered magnet from a hospital in order to make 4 actuators. The quest indicator chooses a hospital for you to visit. Coming back to Boston Airport, you need to go to the main Workbench to make the actuators. It turns out that 4 high-powered magnets are already available there, so no problem making the actuators.

Going to Proctor Ingram again, everything is ready to go, except that no nuclear bombs are available. It is suggested that some are available at a facility in the Glowing Sea, and that you should talk with Scribe Haylen to set up a means of retrieving the bombs once you find them.

After speaking with Scribe Haylen near the Edge of the Glowing Sea, travel out to the Sentinel site. If not previously cleared, there will be some ghouls to occupy your time. Just before reaching your objective you will encounter Brother Henri, a child of Atom. It should be easy enough to convince him that you plan on using the bombs, after which he gives you his password. Once you get to the indicated location, place the distress pulser as indicated and return to Proctor Ingram.

She and Dr. Li decide to let you push the button to activate Liberty Prime as it starts up, although its software still responds using the old software regarding the Chinese occupation of Alaska. Speaking with Proctor Ingram gets you the T60 medic pump.

Bugs

 * Sometimes the section of gate that needs to dissappear for Prime to march on the Institute remains in place after his activation, leaving him stuck in the airport courtyard aimlessly trying to find a way out.
 * When you approach Madison Li, she may not say anything except "Whatever it is, it can wait". To fix this wait 20 seconds, and she will continue with her dialogue.
 * After showing you Liberty Prime, Proctor Ingram might stay in Liberty Prime's room and refuse to speak to you again.
 * When you are told to go to Medford Memorial Hospital, the high-powered magnet won't spawn in the steamer trunk it's supposed to be in.