iOS 9.0 (build 13A4280e) is an official Apple over-the-air update for the iPhone 4s, released on 2015-06-23T18:30:06Z. The update package is 278.39 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: 3147230306711e2c87e171708d5824314cc74d81.zip.