iOS 12.1.3 (build 16D5039a) is an official Apple over-the-air update for the iPhone 6+, released on 2019-01-10T18:09:08Z. The update package is 229 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: b0d005daac61bb426a8a1913a85cbe21ffaa29c6.zip.