iOS 9.9.11.3 (build 15E5216a) is an official Apple over-the-air update for the iPhone 6+, released on 2018-03-16T17:05:19Z. The update package is 1.98 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: d89f4d78236f80dda288e373ec6689f0a994b4d5.zip.