iOS 10.3.3 (build 14G5057a) is an official Apple over-the-air update for the iPhone 6, released on 2017-06-28T16:53:04Z. The update package is 54.49 MB. This is a delta (partial) update that requires 10.3.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 21425fddc61739c7d8caf9deb956847cad4f82ad.zip.