iPadOS 11.3 (build 15E5201e) is an official Apple over-the-air update for the iPad 5 (Cellular), released on 2018-03-05T18:13:56Z. The update package is 282.11 MB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 036e8a80080a2645fab1113834eddea932f0aa51.zip.