iPadOS 9.1 (build 13B5130b) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2015-09-30T17:58:10Z. The update package is 1.38 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: 2a09afb91c52f60e25d0eb4aed5369e85b28583e.zip.