iOS 11.4 (build 15F5037c) is an official Apple over-the-air update for the iPhone SE, released on 2018-04-02T17:06:58Z. The update package is 252.93 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: 6d0620b8c7e00b3434770d170b1f04e0f41e83cf.zip.