iOS 13.1 (build 17A5837a) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2019-09-10T20:20:22Z. The update package is 379.09 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: 06f0b13841895971622bf8a1c7d74711e4904103.zip.