iPadOS 11.3 (build 15E5211a) is an official Apple over-the-air update for the iPad 5 (WiFi), released on 2018-03-12T17:05:30Z. The update package is 202.2 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: 8fded603b5b6bc4d7353dcc739fa225fa86c7d30.zip.