iPadOS 11.4 (build 15F5071a) is an official Apple over-the-air update for the iPad mini 2 (China), released on 2018-05-07T17:10:57Z. The update package is 222.72 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: 8323b663704d512c17db692dd8126bf6fc7e96ef.zip.