iOS 12.3 (build 16F5148a) is an official Apple over-the-air update for the iPhone XR, released on 2019-04-29T17:36:07Z. The update package is 154.17 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: c59aa1530cd5064af048a4f0578b55117dc4bca9.zip.