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 446.16 MB. This is a delta (partial) update that requires 9.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: bbea6a2909b4564f26dcd374736dd2332cc8c64c.zip.