iOS 12.1.3 (build 16D39) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2019-01-22T18:08:30Z. The update package is 1.48 GB. This is a delta (partial) update that requires 11.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 618847fe084d3860cb64b3e36cabdf8cfa05f74e.zip.