iPadOS 9.1 (build 13B143) is an official Apple over-the-air update for the iPad Air (China), released on 2015-10-21T17:15:55Z. The update package is 252.82 MB. This is a delta (partial) update that requires 9.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 852fd1b4b0cc321e1131c8d846b41a72e2d10400.zip.