iOS 11.1 (build 15B5086a) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-10-16T17:04:14Z. The update package is 112.18 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: 4226114256cc49e1c72ab5155ad56dfebe3d6d60.zip.