iOS 12.4 (build 16G5077a) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2019-07-16T17:39:28Z. The update package is 361.12 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: 509f0be588f9e49fc73bc581c8e066132dc1a638.zip.