iOS 11.4 (build 15F5077a) is an official Apple over-the-air update for the iPhone SE, released on 2018-05-14T17:17:21Z. The update package is 249.57 MB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 552a3a758ad76e0f16e09d32d8b7dd30649ebf31.zip.