Forgot to update this. I was trying to restore in my university computer lab after it boot looped, gave me error 1. Turned out, something was blocking the Apple update server despite the software already being downloaded, and my phone in DFU mode. When I got home, restored using my MacBook Pro, no errors.
Almost had a heart attack, since I'm basically just loaning the 6s from T-Mobile on the JUMP On Demand program.