iOS 12.3 (build 16F5139e) is an official Apple over-the-air update for the iPhone XS Max, released on 2019-04-22T17:08:53Z. The update package is 488.35 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: ce70a67f3c9912f15b8120706df32243e554a802.zip.