iOS 13.1 (build 17A5831c) is an official Apple over-the-air update for the iPhone 6s+, released on 2019-09-04T17:06:21Z. The update package is 230.37 MB. This is a delta (partial) update that requires 13.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1933537bd374f96953325cfa42bfff07fb88717e.zip.