iOS 13.1 (build 17A5831c) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2019-09-04T17:06:14Z. The update package is 291.63 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: 8cc3a9deb96eb44b4540c4213fd1078deb9f3567.zip.