iOS 13.4 (build 17E5241d) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2020-02-26T18:17:44Z. The update package is 824.68 MB. This is a delta (partial) update that requires 13.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 61e55b63645420f1703a9f332e0d8014a5a3fe2a.zip.