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 563.98 MB. This is a delta (partial) update that requires 8.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 67128ab3da02aa0646f3c9aa266ba77022a893b0.zip.