I tried to relay to Mass Fusion from the Institute, but there is no pop-up, since I am already enemies with the Brotherhood of Steel, so it will not let me start the quest. I have no previous save point to go to. I'm about 40 hours in and I don't want to restart.
What are my options? Any patch to fix this? I'm playing on Xbox One.
Best Answer
Regrettably, you have likely encountered one of the many glitches in Fallout 4 - this one being more prohibitive than most. Referencing the wikia article for Mass Fusion there is a glitch where you are unable to relay into Mass Fusion when you are enemies with the Brotherhood of Steel - which you are.
As the wikia article states, the only solution to this is to load a save game before becoming hostile to the Brotherhood. As lamentable as it is, this a strong lesson in keeping multiple save states in Bethesda games.