iOS 13.4 (build 17E5223h) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2020-02-05T18:17:23Z. The update package is 801.36 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: 1494e5ccc75f8ce9b3ff2d1df0d08f632798a534.zip.