iOS 12.4 (build 16G5027i) is an official Apple over-the-air update for the iPhone 6s, released on 2019-05-20T17:07:26Z. The update package is 58.1 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: f3a38e7931ca963a73e9bd9c3d07352bd224e395.zip.