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 226.22 MB. This is a delta (partial) update that requires 12.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 09ac8843ad95873fd71ef92af4b570fa9f76645c.zip.