iPadOS 11.4 (build 15F5049c) is an official Apple over-the-air update for the iPad mini 3 (China), released on 2018-04-16T17:07:33Z. The update package is 216.87 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: 1a59f2ad74386844354d27d56e59b6de82d41a0d.zip.