iPadOS 11.4 (build 15F5037c) is an official Apple over-the-air update for the iPad mini 3 (China), released on 2018-04-02T17:06:30Z. The update package is 248.45 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: e3ee74dd7ffbce8b60d4aeb6e01b6ebac2fce15c.zip.