iOS 12.4 (build 16G5038d) is an official Apple over-the-air update for the iPhone 6s+, released on 2019-05-28T17:07:48Z. The update package is 203.84 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: 74625844ac6c2db0e8325e69f91f2fa8f3d416e3.zip.