iOS 13.4 (build 17E5255a) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2020-03-10T17:21:22Z. The update package is 102.97 MB. This is a delta (partial) update that requires 13.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5759bbc5bfe7fc4f6459b18c372a69d135459a34.zip.