Unless you're blind as a bat, I'm sure that you've noticed that we've been building a gantry on the tarmac. Maxson and Kells have been looking for something that'll tip the balance when we go toe to toe with the Institute. Now the Prydwen might be a big beast, but she's not built for fighting. That's where our new project comes in.Ingram

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

Quick walkthrough

Brotherhood of Steel main quest: Liberty Reprimed
Speak to Proctor Ingram.
Follow Proctor Ingram.
Speak to Professor Scara.
Search for Professor Scara OR Speak to Doctor Li.
Speak to Proctor Ingram.
Locate a high-powered magnet.
Construct electromagnetic actuators (4).
Speak to Proctor Ingram.
Speak to Scribe Haylen.
Locate the bomb storage facility.
Locate the Mark 28 stockpile.
Activate the distress pulser.
Speak to Paladin Danse.
Return to Proctor Ingram.
Activate Liberty Prime.
Speak to Proctor Ingram.
Reward: 600 XP
T-60 medic pump
Leads to: A Loose End
Blind Betrayal

Detailed walkthrough

After the successful completion of both From Within and Outside the Wire, the Sole Survivor will be told by Elder Maxson to speak to Ingram at Boston Airport to work on a secret project. Meet Ingram at the airport and she will lead them to a sealed area of the depot where the remains of Liberty Prime, the Brotherhood war machine that was destroyed by the Enclave ten years ago, are stored. She mentions the difficulty the Brotherhood has had getting it back on to its feet, and that they need the help of a scientist skilled in power systems. The next step depends on the player's choices while they were in the Institute.

Madison Li Fallout4.png
===Convince Dr Li to work on Liberty Prime===

If one has successfully completed From Within for Elder Maxson by convincing Madison Li to leave the Institute and work again for the Brotherhood, Ingram will let the player character know that she is reluctant to help on Liberty Prime, and ask them to convince her.

Return to the Prydwen and talk to Li. She will make it clear that she does not wish to work on Prime and "make the same mistake twice." Despite her reservations, all speech paths ultimately lead to her helping. Return to Ingram to continue the mission.

FO4 Professor Scara Portait.png

Find Professor Scara

If one hasn't been able to recruit Li for the Brotherhood by becoming enemies with the Institute before the quest, Ingram will tell the Sole Survivor about a scientist proficient in robotics by the name of Professor Scara, who resides in Diamond City, and ask them to convince her to work for the Brotherhood. She will give the player character a piece of technology to help convince Scara.

Head for the Science! Center in Diamond City, where Scara resides. However, one will only encounter Duff, her partner. By looking at Scara's terminal (Hacker rank 3 required) or by talking to Duff about it, the Survivor will discover that Scara headed for the General Atomics Galleria.

Head for the galleria, a place inhabited by non-hostile Mister Handies and Mister Gutsies. Scara is found in the Back Alley Bowling building. However, the Survivor will not be allowed access to the bowling alley without turning the robots hostile if they don't pass a speech check, have an employee ID from the General Atomics factory, pay 5000 pre-War money, or trigger the grand reopening. For more information, see the miscellaneous quest, Galleria.

Once the reopening has been triggered, return to Back Alley Bowling. The Mister Handy at the counter will let the player character know that they are allowed to visit the area. In Back Alley Bowling, the Survivor will find Scara. To convince her to work for the Brotherhood, the player character will need to either give her Ingram's piece of technology, or pass one of three easy speech checks. Once Scara is hired, return to Ingram.

Construct electromagnetic actuators

Once the Sole Survivor returns to the airport, Li/Scara will tell them that, in order to fix Prime's arms and legs, they will need to make four 電磁傳動裝置. They will then be given the 電磁傳動裝置清單, which lists the components required for each one. In total, they will require:

  • High-powered magnet x4
  • Screw x4
  • Fiber optics x12
  • Circuitry x20
  • Rubber x20
  • Steel x40

Fortunately, the Sole Survivor is only required to find a single high-powered magnet, as the remaining items will automatically be deposited into the workshop. The magnets are a relatively rare item, but may be found in a few areas or bought from certain traders. The quest log will point towards a building containing one, usually Milton General Hospital or Medford Memorial Hospital, but visiting this location is not necessary, assuming the magnet can be found elsewhere.

Once all the required materials have been found, go to the airport workbench and craft the four actuators by placing them on the ground. Return to Ingram once the actuators are ready.

Find the nukes for Liberty Prime

Ingram will tell the Sole Survivor that Prime is still missing one of its key components: nukes to use in combat. She will inform them that Proctor Quinlan found information about a pre-War bomb storage facility located somewhere within the Glowing Sea, which holds 28型核武儲備. Make preparations for the next assignment, then head for the northern part of the Glowing Sea, at Waypoint Echo, where one will meet Scribe Haylen. She will give the player character a 救難訊號發送器 to use once they have found the nukes.

Head for the southeastern Glowing Sea where the Sentinel site can be found, which holds the nukes. The area is inhabited by a large population of feral ghouls, so be prepared to fight. To access the main area, one will need to use the Sentinel site blast door override holotape or use one of the terminals to cancel the launch order and access the facility. Head for the tunnels, where one will meet a large number of ghouls. At the end of the tunnel, one will see the blast door to the stockpile area. The door one can enter from is on the left, next to the broken terminal. This area is guarded by Brother Henri of the Church of the Children of Atom, who will ask the Sole Survivor the reason for their presence, stating that the area is "Atom's hallowed ground." One will need to pass a medium-difficulty Speech check to convince him to give the player character the password to the computer that unlocks access to the nukes. If the Far Harbor add-on is installed and the player character has joined the Children of Atom, they can pass an easy speech check saying they are a Child of Atom from the church in the north. Otherwise, the player character will have to eliminate him. Henri himself isn't that much of a threat, but he is accompanied by an assaultron named Atom's Wrath that will attack the player character along with Henri. Loot the password from Henri's body, then use the terminal to unlock the storage area, where the player character will need to use the pulser. If Danse is the current companion, he will tell the player character that he will stay behind to ensure the nukes reach the airport safely. If Danse is not the current companion, then his affinity drops to zero.

Return to Ingram to inform her of the mission's success.

Activate Liberty Prime

After a short discussion with Ingram and Scara/Li, the player character will be allowed to push the button to finally power up Liberty Prime. Danse's affinity will drop to zero after Liberty Prime completes all its diagnostics, if it hasn't already done so. But it will restore back to its previous level after talking to Ingram. After Liberty Prime is ready, talk with Ingram and the mission completes. Ingram will give the player character a medical pump mod for T-60 power armor. She will then state that Maxson would like to speak with the player character, which starts the next quest, Blind Betrayal.

Companion reactions

Convince Dr Li to rebuild liberty prime by suggesting she does it to avenge Brian VirgilNo reactionLikeLikeHatesNo reactionNo reactionNo reactionLikeDislikesLikeLikeHatesNo reactionLike
Convince Dr Li to help rebuild Liberty Prime in order to end the Institute's greed.No reactionLikeNo reactionLoveLikeLikeNo reactionLikeDislikesLikeLikeHatesNo reactionNo reaction
Convince Dr Li to help rebuild Liberty Prime as the Brotherhood of Steel care about what happens to the CommonwealthDislikesLikeLikeLoveLikeLikeDislikesLikeDislikesNo reactionLikeDislikesNo reactionDislikes
Threaten to have Dr Li shot if she doesn't help rebuild Liberty Prime.No reactionNo reactionNo reactionLikeNo reactionNo reactionNo reactionNo reactionNo reactionNo reactionNo reactionNo reactionHatesLove
Don't ask Duff why she is upsetNo reactionNo reactionNo reactionLikeNo reactionNo reactionNo reactionNo reactionNo reactionNo reactionNo reactionNo reactionLikeNo reaction
Demand to know where Scara is when speaking to DuffLikeNo reactionDislikesDislikesNo reactionNo reactionLikeDislikesNo reactionNo reactionDislikesLikeLikeLike
Offer to help Duff with the issue that has upset herDislikesLikeLikeLikeNo reactionLikeDislikesLikeNo reactionLikeLikeNo reactionNo reactionDislikes

Quest stages

10 Talk to Proctor IngramI've been informed that Proctor Ingram has a special project that requires my immediate assistance.
20 Follow Proctor Ingram
30 Speak to Proctor IngramI've discovered that Proctor Ingram's special project is the reconstruction of Liberty Prime, the Brotherhood of Steel's massive war machine. It looks like it needs a lot of work to get up and running.
40 Locate Professor ScaraIn order to get Liberty Prime's power systems stabilized, Proctor Ingram has tasked me with finding a robotics expert in Diamond City named Professor Scara and asking for her assistance.
60 Talk to Professor Scara
70 Speak to Doctor LiIn order to get Liberty Prime's power systems stabilized, Proctor Ingram has asked me to speak to Doctor Li on the Prydwen. Apparently, the thought of working on the huge robot has given her second thoughts.
I was able to convince Doctor Li to work on Liberty Prime without incident. I should inform Proctor Ingram of my progress.
In order for her to agree to work on Liberty Prime, I was forced to threaten Doctor Li. I should inform Proctor Ingram of my progress.
90 Speak to Proctor Ingram
95 Find a High-powered magnetTo assist in the construction of Liberty Prime's limbs, I need to recover a High-Powered Magnet. One of the hospital ruins should have the part that I need.
100 Construct electromagnetic actuatorsUsing High-Powered Magnets, I need to build four Electromagnetic Actuators at the airport's workshop.
120 Speak to Proctor IngramI've successfully built four Electromagnetic Actuators. I should inform Proctor Ingram of my progress.
140 Speak to Scribe HaylenProctor Ingram has ordered me to recover enough Mark 28 Nuclear Bombs to fully arm Liberty Prime. I'm supposed to meet Scribe Haylen at the edge of the Glowing Sea for further instructions.
160 Locate bomb storage facilityScribe Haylen has sent me into the Glowing Sea to find a stockpile of Mark 28 Nuclear Bombs. She provided me with a Distress Pulser to signal her when the weapons have been located.
190 Speak to Paladin Danse
195 Speak to Proctor IngramI've located the stockpile of Mark 28 Nuclear Bombs in Sentinel Site Prescott and signaled Scribe Haylen with the Distress Pulser. I should return to Proctor Ingram to inform her of my progress.
200 Activate Liberty PrimeWith Liberty Prime fully complete, all that remains is turning on his power switch for the first time.
210 Speak to Proctor Ingram
255Quest finishedQuest complete[LOG] Liberty Prime is back online.
355Quest failedQuest failed


  • Danse will be hidden by the game upon the player's departure from the Sentinel site; however, he will still technically be in the last position in which the player character encountered him, just invisible. This means that any actions that would garner his approval (e.g. modding weapons) or disapproval (e.g. taking chems) taken in the vicinity will still alter his affinity.
  • This quest can be completed before getting too deep into the Institute questline - more specifically, before advancing in the quest Mass Fusion. It is possible to start Mass Fusion but speaking with Allie Filmore renders one unable to progress any further in the Brotherhood questline until either Mass Fusion or Spoils of War is completed, as Proctor Ingram will be locked to a dialogue tree related to those quests and one won't be able to turn in this quest to her.
    • Therefore this stalls the faction storylines at a point where one must choose to have either the Institute or the Brotherhood become hostile. Siding with the Institute will block the mission Blind Betrayal and effectively removes Paladin Danse from the game as noted above.
    • Alternatively, if one has started Mass Fusion but hasn't yet completed Shadow of Steel, they can still go through the BoS missions and be able talk to Proctor Ingram for Liberty Reprimed.


  • Has platform::Playstation 4Playstation 4 Has platform::Xbox OneXbox One Building electromagnetic actuators won't give credit towards 4/4 actuators built. Occasionally progress is rewarded but more often negative progress is observed (e.g. "-2/4 actuators built"). Repeatedly storing and replacing the actuators may relieve the issue.[已验证]
  • Has platform::PCPC Has platform::Xbox OneXbox One Sometimes the section of gate that needs to disappear 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.[已验证]
  • Has platform::PCPC Has platform::Playstation 4Playstation 4 Has platform::Xbox OneXbox One When you approach Madison Li, she may not say anything except "Whatever it is, it can wait". To fix this wait 20 seconds, then she will continue with her dialogue.[已验证]
  • Has platform::PCPC Has platform::Xbox OneXbox One After showing you Liberty Prime, Proctor Ingram might stay in Liberty Prime's room and refuse to speak to you again.[已验证]
  • Has platform::PCPC Has platform::Playstation 4Playstation 4 Has platform::Xbox OneXbox One 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.[已验证]
  • Has platform::PCPC Has platform::Xbox OneXbox One Sometimes it isn't possible to speak to Proctor Ingram in the first stage of this quest and no quest marker appears after accepting the quest. Ingram will keep talking about non-quest dialogue. Setting the quest's stage to 10/first stage may solve the problem.[已验证]
  • Has platform::PCPC If the player has Spoils of War as an active quest, it is not possible to interact with Proctor Ingram to advance in this quest.[已验证]
    • To remedy this, use console commands setstage ae51c 70, setstage ae51c 95 and setstage ae51c 140 to bypass the interactions with Proctor Ingram.