iOS 12.3 (build 16F5148a) is an official Apple over-the-air update for the iPhone X (GSM), released on 2019-04-29T17:36:04Z. The update package is 118.43 MB. This is a delta (partial) update that requires 12.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 849e3eef376b4fa3dd2291a017f9effc66d8eb5b.zip.