iPadOS 9.1 (build 13B5119e) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2015-09-23T17:55:05Z. The update package is 177.48 MB. This is a delta (partial) update that requires 9.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2cef4e233cdb90887fded8a10a88509c88c0c55c.zip.