iPadOS 12.3 (build 16F5155a) is an official Apple over-the-air update for the iPad 6 (Cellular), released on 2019-05-07T17:03:59Z. The update package is 400.9 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: 0b0beb6fc9d8b2fdf3f81d6031e19f4272afc37f.zip.