iPadOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPad 5 (WiFi), released on 2018-03-29T17:10:08Z. The update package is 708.52 MB. This is a delta (partial) update that requires 11.0.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 441b15c2d1b5f4faf2b9a45cabe47fdc20c673c2.zip.