iOS 9.3 (build 13E234) is an official Apple over-the-air update for the iPhone 6s+, released on 2016-03-21T18:56:38Z. The update package is 353.49 MB. This is a delta (partial) update that requires 9.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 75788277522119222a5520919fd2d9bb621a6e6f.zip.