iOS 9.3 (build 13E5214d) is an official Apple over-the-air update for the iPhone 4s, released on 2016-02-22T17:47:30Z. The update package is 82.33 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: e47f9c4e4ba9178cdd6a8ef68056189071ec6583.zip.