iPadOS 12.3 (build 16F5117h) is an official Apple over-the-air update for the iPad Air (China), released on 2019-03-27T17:05:43Z. The update package is 287.54 MB. This is a delta (partial) update that requires 12.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8c9aae3e2e2d0ffbd53b2a7d98ce8e96a77f77bc.zip.