iOS 12.1.3 (build 16D39) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2019-01-22T18:08:36Z. The update package is 418.8 MB. This is a delta (partial) update that requires 12.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2e10db4b3efa640eb08753acf3846bb4773f90f6.zip.