iOS 15.7.4 (build 19H321) is an official Apple over-the-air update for the iPhone 6s+, released on 2023-03-27T17:12:51Z. The update package is 3.16 GB. This is a delta (partial) update that requires 13.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3f35b74adeb7125a05753f053f34be49c23d9420.zip.