iPadOS 8.4.1 (build 12H321) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2015-08-13T18:05:09Z. The update package is 402.78 MB. This is a delta (partial) update that requires 8.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 54474e26179b155753c072533f62716d34923dbc.zip.