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 393.53 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: 11e1df0684796ef306a3ca37ffaf3022e9dccad2.zip.