iPadOS 11.4 (build 15F5049c) is an official Apple over-the-air update for the iPad mini 3 (China), released on 2018-04-16T17:07:37Z. The update package is 212.31 MB. This is a delta (partial) update that requires 11.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: af3357dd0dca26b6ce8d1fb899fcd1e6ef9d6964.zip.