iPadOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPad 5 (Cellular), released on 2018-03-29T17:10:25Z. The update package is 584.74 MB. This is a delta (partial) update that requires 11.2.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4203f2e6e52beac8f3916f1901e25696f66bdcad.zip.