iPadOS 9.9.11.4 (build 15F79) is an official Apple over-the-air update for the iPad Air (China), released on 2018-05-29T17:13:14Z. The update package is 1.35 GB. This is a delta (partial) update that requires 9.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6e7f5012c162c02e4a18c1ed56fe28a221e1c147.zip.