iOS 15.7.4 (build 19H321) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2023-03-27T17:13:16Z. The update package is 1.41 GB. This is a delta (partial) update that requires 15.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d2e1978e80ac6c57c6b1fcfde55e721aef0f047b.zip.