iOS 12.3 (build 16F5155a) is an official Apple over-the-air update for the iPhone XR, released on 2019-05-07T17:04:19Z. The update package is 85.06 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: 60a00c48013964beab44d28a7ff1f6d87c6baf96.zip.