iOS 13.4.5 (build 17F5044d) is an official Apple over-the-air update for the iPhone 6s, released on 2020-04-15T17:16:13Z. The update package is 322.52 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: 42d0d67a136df801cfe5851d86eb983543379c8e.zip.