iOS 12.3 (build 16F5155a) is an official Apple over-the-air update for the iPhone 6, released on 2019-05-07T17:04:23Z. The update package is 403.96 MB. This is a delta (partial) update that requires 12.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 649664150d0ac8e9eb3ff5d6d98d322463a143ef.zip.