iPadOS 9.1 (build 13B5130b) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2015-09-30T17:58:07Z. The update package is 207.44 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: 2cd0ed6ae49b7bbca11e7cb3d38e6f070f9c5b6c.zip.