iOS 12.3 (build 16F5148a) is an official Apple over-the-air update for the iPhone 6, released on 2019-04-29T17:36:11Z. The update package is 403.93 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: be33885676c497f2c326ed6e7605968a3c7cc085.zip.