iPadOS 9.1 (build 13B5119e) is an official Apple over-the-air update for the iPad Air (China), released on 2015-09-23T17:55:05Z. The update package is 1.41 GB. This is a delta (partial) update that requires null already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1c432b04f0311084ef89421b5f3a6e79c6fa868b.zip.