iPadOS 9.9.11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad Air (China), released on 2017-12-13T18:04:16Z. The update package is 1.31 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: 7cda5539a44e424964097b669dd59d34dce59405.zip.