iOS 12.3 (build 16F5155a) is an official Apple over-the-air update for the iPhone X (Global), released on 2019-05-07T17:04:11Z. The update package is 451.49 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: a1c4a3d3ad41b095b3ffa1c1ff4407b529cb9017.zip.