iOS 12.3 (build 16F5156a) is an official Apple over-the-air update for the iPhone XS, released on 2019-05-10T17:09:36Z. The update package is 81.35 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: d4e0f84c18f05b3eda5077c6d541ce6d3b717eb2.zip.