iOS 12.4 (build 16G5046d) is an official Apple over-the-air update for the iPhone 6s, released on 2019-06-11T17:07:44Z. The update package is 287.55 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: a77c04d3d182a20fe031b5cd9ab31354790c2267.zip.