iOS 9.0 (build 13A4325c) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2015-08-06T18:44:17Z. The update package is 317.39 MB. This is a delta (partial) update that requires 9.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 71467f114384c1dd271ae7036a27b27b927c0e55.zip.