iOS 15.7.4 (build 19H321) is an official Apple over-the-air update for the iPhone 6s+, released on 2023-03-27T17:12:53Z. The update package is 2.59 GB. This is a delta (partial) update that requires 14.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f9038d9ea48d07a42f1ae68baeb0ad0617838377.zip.