iPadOS 12.0 (build 16A5288q) is an official Apple over-the-air update for the iPad Air (China), released on 2018-06-05T09:51:38Z. The update package is 1.11 GB. 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: d84c942204ed8682e2e2476fe5b550814d78ec4b.zip.