iOS 13.4 (build 17E5241d) is an official Apple over-the-air update for the iPhone 6s+, released on 2020-02-26T18:17:56Z. The update package is 711.68 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: 3f516d49581af667c9241361b349ea76399a8fe3.zip.