iOS 11.0.3 (build 15A432) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-10-11T17:06:58Z. The update package is 1.02 GB. This is a delta (partial) update that requires 10.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: bc7d2f9d8c3c8796c91967a4ad0a7d15e5a9034d.zip.