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 251.08 MB. This is a delta (partial) update that requires 13.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: afc3a533386665d0e8ab30085c947a45a4e24b93.zip.