iOS 11.0 (build 15A372) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-09-12T19:09:35Z. The update package is 1018.16 MB. This is a delta (partial) update that requires 10.3.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5760c02dbfecf4350b1a2cff1fcad58f0f8b8d35.zip.