iPadOS 12.3 (build 16F5156a) is an official Apple over-the-air update for the iPad Pro 3 (12.9-inch, Cellular, 1TB Model), released on 2019-05-10T17:09:20Z. The update package is 473.61 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: f1dc8733ed46a1dbbf956ef0b0aecbdc178a4730.zip.