iOS 12.4 (build 16G5046d) is an official Apple over-the-air update for the iPhone 6, released on 2019-06-11T17:07:43Z. The update package is 286.69 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: 94ccbdd5e692b0166aaf9fe4e35cdf3f9d36d0f1.zip.