iOS 11.4 (build 15F5077a) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2018-05-14T17:17:15Z. The update package is 248.63 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: 2817dea1ad37d3320ede927ad2a2bbe0cde8ccc4.zip.