iOS 13.1 (build 17A5844a) is an official Apple over-the-air update for the iPhone 8 (Global), released on 2019-09-18T17:06:52Z. The update package is 122.78 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: df63ab90a4bb4e4e74154017101ebf7cde59fed5.zip.