iPadOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2018-03-29T17:09:57Z. The update package is 705.31 MB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 42f20ef0ef8cbef0ac33aada8e288b04eef5c1d3.zip.