iOS 9.9.11.2.1 (build 15C153) is an official Apple over-the-air update for the iPhone 6+, released on 2017-12-13T18:12:20Z. The update package is 1.67 GB. This is a delta (partial) update that requires 8.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a62d7267fd33a982f90366e81e6354b12ca1f456.zip.