Bryan, after his death and recreation into an animatronic, was not taken to Star Mall with the rest of the Glamrocks. Instead, Bryan was put in a decrepit storage unit, and left to rot.
After [REDACTED] months, he boots up in the storage unit. Before he had been put into storage, his body had been used for parts. What had originally been only a few missing face plates and missing endoskeleton parts, turned into injuries much worse. While broken, staggering, and missing his memories, one thing was clear. It was, strange, something he knows he shouldn't remember, but he did. It was a promise to someone.
"I'll make it home, don't worry [REDACTED]! I promise I'll come back."
He'll keep that promise, whatever it takes, he'll make it back home.