iOS 9.3 (build 13E5225a) is an official Apple over-the-air update for the iPhone 6+, released on 2016-03-01T18:13:48Z. The update package is 152.86 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: 25dd5b8bd5a9fdaa6fe3713e1badb8e5caa64132.zip.