iOS 9.3 (build 13E5181f) is an official Apple over-the-air update for the iPhone 6, released on 2016-01-14T18:01:26Z. The update package is 28.7 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: 525d1cc0ea5601fae5325b088b21db5d53cbee7e.zip.