iOS 12.3 (build 16F5155a) is an official Apple over-the-air update for the iPhone 6, released on 2019-05-07T17:04:24Z. The update package is 63.93 MB. This is a delta (partial) update that requires 12.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: baa0393a6fce564c68fb63a33581a9e8e235d355.zip.