iOS 12.3 (build 16F5139e) is an official Apple over-the-air update for the iPhone X (GSM), released on 2019-04-22T17:08:51Z. The update package is 450.5 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: 87814e50a4972826d1d7b74046f3c613c0dd36a2.zip.