iPadOS 12.3 (build 16F5139e) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2019-04-22T17:07:44Z. The update package is 347.37 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: 06861004d9e7deac065ef8451473f4923b035554.zip.