iOS 11.4 (build 15F5061d) is an official Apple over-the-air update for the iPhone SE, released on 2018-05-01T17:06:09Z. The update package is 214.08 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: ae275d1bbd20592e77f9a91b7dc4c9cae2c51545.zip.