iOS 11.1 (build 15B5078e) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-10-09T17:02:20Z. The update package is 122.96 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: 31e51e3385959dac4f2dc4fd9eddd9385a5035ec.zip.