iOS 12.3 (build 16F5139e) is an official Apple over-the-air update for the iPhone XS, released on 2019-04-22T17:08:52Z. The update package is 488.96 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: 1047d1b37e66a8e0f04e4be443c8ba3f6db4a230.zip.