iPadOS 11.4 (build 15F5071a) is an official Apple over-the-air update for the iPad mini 2 (China), released on 2018-05-07T17:10:58Z. The update package is 173.32 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: 8d2dab161889b36870f28c8401f62effba82eebc.zip.