iOS 9.3 (build 13E5214d) is an official Apple over-the-air update for the iPhone 6, released on 2016-02-22T17:47:44Z. The update package is 134.08 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: 235f4efa1ce80f8ee9cf9a5a5e3bb0ff0f6c039e.zip.