iOS 9.9.12.3 (build 16F5139e) is an official Apple over-the-air update for the iPhone 6, released on 2019-04-22T17:08:58Z. The update package is 2.19 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: 077b4b73342e71da9e9c33e27711ceb21620ce12.zip.