iPadOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPad 5 (Cellular), released on 2018-03-29T17:10:20Z. The update package is 677.27 MB. This is a delta (partial) update that requires 11.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 45e0a67e5fe641150f70f88e62a772c72fce105e.zip.