iOS 12.4 (build 16G5027g) is an official Apple over-the-air update for the iPhone 6s+, released on 2019-05-15T17:05:45Z. The update package is 210.51 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: b80754362f51bf1eac301aa170e345cacf333469.zip.