iOS 9.3 (build 13E5233a) is an official Apple over-the-air update for the iPhone 4s, released on 2016-03-14T21:45:37Z. The update package is 20.94 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: 676fc521431c11efebf2336cafc65d80106f7e2b.zip.