iOS 13.4 (build 17E5233g) is an official Apple over-the-air update for the iPhone 6s+, released on 2020-02-19T18:24:56Z. The update package is 783.38 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: eb0a3eac5381a0c5665d7db5ded9d55a6d1c41c2.zip.