iPadOS 8.2 (build 12D508) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2015-03-09T18:49:04Z. The update package is 1.51 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: b180629c5772a1222eaf676571b67e6878eab4f2.zip.