iOS 9.3 (build 13E5214d) is an official Apple over-the-air update for the iPhone 4s, released on 2016-02-22T17:47:31Z. The update package is 65.41 MB. This is a delta (partial) update that requires 9.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b30a6a933f1df90c8941263334dc93c0192799f1.zip.