iOS 12.1.3 (build 16D39) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2019-01-22T18:08:35Z. The update package is 522.93 MB. This is a delta (partial) update that requires 12.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e4191d273bac57be60b660af178136bf14668074.zip.