iOS 9.3 (build 13E233) is an official Apple over-the-air update for the iPhone 6, released on 2016-03-21T18:56:30Z. The update package is 1.1 GB. This is a delta (partial) update that requires 8.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 71fb2cb8242c3ff575c4e2d0de3d1b6603051f7d.zip.