iOS 15.7.4 (build 19H321) is an official Apple over-the-air update for the iPhone 6s, released on 2023-03-27T17:12:45Z. The update package is 2.33 GB. This is a delta (partial) update that requires 14.5.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 43d7359e4d0bdb755095915e71f988255bc78c04.zip.