iOS 11.0 (build 15A5372a) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-09-06T16:51:06Z. The update package is 36.01 MB. This is a delta (partial) update that requires 11.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7065cb385496ba829eb525730c00decf014b8e9b.zip.