iOS 12.3 (build 16F5129d) is an official Apple over-the-air update for the iPhone 8 Plus (Global), released on 2019-04-08T17:04:56Z. The update package is 345.78 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: 4dfaeef05f15310e075d7a22af325d7434d9d5c4.zip.