iPadOS 8.1.2 (build 12B440) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2014-12-09T17:49:03Z. The update package is 1.38 GB. This is a delta (partial) update that requires 7.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e78f4bac1e98452b08c38aaa1c000ca015e29b44.zip.