iOS 9.3 (build 13E233) is an official Apple over-the-air update for the iPhone 6+, released on 2016-03-21T18:56:27Z. The update package is 1.36 GB. This is a delta (partial) update that requires 8.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ebe1123062b2a0e2b1b8154c62a2c14d71196afb.zip.