iOS 15.7.4 (build 19H321) is an official Apple over-the-air update for the iPhone SE, released on 2023-03-27T17:12:59Z. The update package is 707.16 MB. This is a delta (partial) update that requires 15.7.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b113781361854d33e3320619b17d2fee37cd6554.zip.