iOS 9.9.11.2.1 (build 15C153) is an official Apple over-the-air update for the iPhone 6+, released on 2017-12-13T18:12:07Z. The update package is 1.72 GB. This is a delta (partial) update that requires 8.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d56aaef53e0159f44c18784cfef81e47a8fd05bc.zip.