iOS 10.3 (build 14E5269a) is an official Apple over-the-air update for the iPhone 6, released on 2017-03-08T17:59:50Z. The update package is 412.16 MB. This is a delta (partial) update that requires 10.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 90cf94b54ccb4f2fdd70f73f20e0e4d983c2cce0.zip.