iOS 12.4 (build 16G5056d) is an official Apple over-the-air update for the iPhone 6, released on 2019-06-24T17:17:29Z. The update package is 194.23 MB. This is a delta (partial) update that requires 12.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d2af7d59f646817c65818c9c0fb6a9fdabb59d73.zip.