iOS 12.3 (build 16F5139e) is an official Apple over-the-air update for the iPhone XR, released on 2019-04-22T17:08:54Z. The update package is 476.4 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: 3e4363e3f3f79665a40d024e1d1eff05c60fe656.zip.