iOS 12.3 (build 16F5129d) is an official Apple over-the-air update for the iPhone X (Global), released on 2019-04-08T17:04:57Z. The update package is 403.2 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: b692f42ecc21705c44d97bf0e9a45df58b423b52.zip.