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 1.05 GB. This is a delta (partial) update that requires 10.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b72bfa3969ec245b3d34fb8792bf7de632372a74.zip.