iOS 9.3 (build 13E5191d) is an official Apple over-the-air update for the iPhone 6, released on 2016-01-25T20:52:48Z. The update package is 127.03 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: f948686ca90d13dfd960998fb9a5309896a2d54b.zip.