Burning Cover

Burning Cover is a Railroad side quest in Fallout 4. It is the aftermath of failing Underground Undercover and becoming branded an enemy of The Institute, which also fails all other active, related Railroad quests.

Quick walkthrough

 * 1) Report to Desdemona.
 * 2) Find the Minutemen or talk to Preston.

Detailed walkthrough
This quest is fairly straightforward and only requires talking to two people.

The Sole Survivor has blown their cover, and must speak to Desdemona for the next step. When talking to her, she explains that there is little hope for rescuing any synths now that communication with Z1-14 is lost, and that the Railroad numbers are too few to challenge the Institute directly. She instructs seeking out the Commonwealth Minutemen, as they are the only army capable of forcibly freeing the synths. Desdemona also thinks the Minutemen might be able to find another way into the Institute with the data found in the holotape.

The next step is to talk to Preston Garvey. Depending on how far the Sole Survivor had advanced in the Minutemen storyline determines his reaction, but ultimately will agree to support. This marks the completion of Burning Cover. Afterward, the Sole Survivor must work with either the Minutemen or the Brotherhood of Steel to destroy the Institute.