iPadOS 8.4.1 (build 12H321) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2015-08-13T18:05:10Z. The update package is 205.01 MB. This is a delta (partial) update that requires 8.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: df53380e224b2265fc70e97fefe6d1ef1ac8f039.zip.