iOS 12.3 (build 16F5156a) is an official Apple over-the-air update for the iPhone XR, released on 2019-05-10T17:09:37Z. The update package is 79.34 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: 167335c5c45225af919cbe6e1d2c64117867481d.zip.