iOS 11.1 (build 15B5086a) is an official Apple over-the-air update for the iPhone 6, released on 2017-10-16T17:04:16Z. The update package is 129.16 MB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7377c9037f96c076019079e8a1ec03559946510d.zip.