iPadOS 12.3 (build 16F5148a) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2019-04-29T17:35:46Z. The update package is 365.8 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: c8d194c0db2c342100a7e7356f7d3bd9ba35f4b6.zip.