iPadOS 9.9.11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2017-12-13T18:07:52Z. The update package is 1.34 GB. This is a delta (partial) update that requires 9.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f3d0e9a78a61fa838743d519f43f8ba2151d7a04.zip.