iOS 12.1.3 (build 16D39) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2019-01-22T18:08:37Z. The update package is 281.78 MB. This is a delta (partial) update that requires 12.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b668ae4c6b9f41489b44b28538b64785c3d56d55.zip.