iOS 13.1 (build 17A5837a) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2019-09-10T20:22:58Z. The update package is 380.24 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: 40b69ae7234f66e97d7c80a1473dcfc632f5e80c.zip.