iOS 9.0 (build 13A4305g) is an official Apple over-the-air update for the iPhone 4s, released on 2015-07-21T19:26:09Z. The update package is 221.81 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: 3bef7d3c979fbc4b2686bb083cb776e0d2d42f42.zip.