iPadOS 12.3 (build 16F5155a) is an official Apple over-the-air update for the iPad Pro 9.7-inch (WiFi), released on 2019-05-07T17:03:52Z. The update package is 58.85 MB. This is a delta (partial) update that requires 12.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e6491a85a500912043dfa7ea0bdf9a6487ef1536.zip.