iOS 9.9.10.3 (build 14E277) is an official Apple over-the-air update for the iPhone 6s+, released on 2017-03-27T16:58:18Z. The update package is 1.35 GB. This is a delta (partial) update that requires 9.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 87f242fcac16bc5c21d1b05fe24f92fdda2d7d33.zip.