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 213.36 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: d31f113db61d236c43481e3f6a18760f314ceb56.zip.