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 812.3 MB. This is a delta (partial) update that requires 8.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6a820a490744f1cd9bd4951970cbec84519dee01.zip.