iPadOS 8.4.1 (build 12H321) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2015-08-13T18:05:12Z. The update package is 743.29 MB. This is a delta (partial) update that requires 8.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: bffef87e21d88f2de26da8fbda73d5e9304d1eea.zip.