iPadOS 11.4 (build 15F5061d) is an official Apple over-the-air update for the iPad mini 2 (China), released on 2018-05-01T17:05:39Z. The update package is 171.39 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: fc6aef18092a5b4a47dce61c5eda7d84e2ec7c77.zip.