iOS 11.4 (build 15F5049c) is an official Apple over-the-air update for the iPhone SE, released on 2018-04-16T17:08:24Z. The update package is 218.8 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: 1900e8347e2daac9ca1ea1a7edc86b135d304e44.zip.