iOS 12.3 (build 16F5117h) is an official Apple over-the-air update for the iPhone XR, released on 2019-03-27T17:06:23Z. The update package is 335.33 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: 3c7d041711674dddc8588ead57a2555e1f686709.zip.