iOS 9.0.2 (build 13A452) is an official Apple over-the-air update for the iPhone 4s, released on 2015-09-30T17:58:31Z. The update package is 895.66 MB. This is a delta (partial) update that requires 8.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 19f8c7d19ba3b0b8d0ee34c149ebe6078ec5b6eb.zip.