iOS 9.3 (build 13E5231a) is an official Apple over-the-air update for the iPhone 6s+, released on 2016-03-07T17:48:57Z. The update package is 37.43 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: c91c6ff9ba90c1e446381f1f7a76316b1439364c.zip.