iPadOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPad mini 4 (Cellular), released on 2018-03-29T17:09:02Z. The update package is 608.55 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: 468420d45b6e4031d9f2c1ddd9565321e9aba73e.zip.