iOS 15.7.4 (build 19H321) is an official Apple over-the-air update for the iPhone 7 (Global), released on 2023-03-27T17:13:01Z. The update package is 1.2 GB. This is a delta (partial) update that requires 15.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9105670ff2a00cd70188d30fb06b4a2b6ca9d559.zip.