iOS 9.0 (build 13A5344) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2015-09-16T18:02:02Z. The update package is 1.33 GB. This is a delta (partial) update that requires null already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0cd49f09511f9633bc69e07d40adc1b3d91f48cc.zip.