iPadOS 8.1.3 (build 12B466) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2015-01-27T17:55:04Z. The update package is 627.26 MB. This is a delta (partial) update that requires 8.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f3c2b2b1643cc92ad0d4806d77b759aeff18cf36.zip.