iPadOS 12.3 (build 16F5129d) is an official Apple over-the-air update for the iPad mini 3 (Cellular), released on 2019-04-08T17:04:08Z. The update package is 356.25 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: 604ab84ae2cabd378808cdb8bd254a0707c53bfd.zip.