iOS 9.9.10.3 (build 14E5269a) is an official Apple over-the-air update for the iPhone 6+, released on 2017-03-08T17:58:47Z. The update package is 1.87 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 57c3b68456f9757cb0f0ea36e14a56b794b802c7.zip.