iOS 12.1.3 (build 16D5039a) is an official Apple over-the-air update for the iPhone 6, released on 2019-01-10T18:09:10Z. The update package is 34.93 MB. This is a delta (partial) update that requires 12.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f862c76349dc4f4f6bd485b9ad1b4ebc4714ef4d.zip.