iOS 11.4 (build 15F5071a) is an official Apple over-the-air update for the iPhone SE, released on 2018-05-07T17:11:51Z. The update package is 249.51 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: f664abfc2f17b47bc575aa081e7534ae8b6a138f.zip.