iPadOS 9.1 (build 13B5119e) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2015-09-23T17:55:08Z. The update package is 1.42 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: ac7ffcef9f571a02c0ad40d563638b10e3a4af21.zip.