iPadOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPad mini 4 (WiFi), released on 2018-03-29T17:08:28Z. The update package is 608.6 MB. This is a delta (partial) update that requires 11.2.6 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a057c27abe688b772317153f5746ca6af1c37b2e.zip.