iOS 9.9.11.2.1 (build 15C153) is an official Apple over-the-air update for the iPhone 6+, released on 2017-12-13T18:12:32Z. The update package is 1.41 GB. This is a delta (partial) update that requires 9.3.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1c5fcd18ae9044d29cdd35aa0d5f7c0496b4e394.zip.