iOS 13.4 (build 17E5249a) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2020-03-03T18:20:10Z. The update package is 827.04 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: 18d14271102bef26cbdf67688c3ed9e3411831f1.zip.