iOS 13.1 (build 17A5837a) is an official Apple over-the-air update for the iPhone 6s, released on 2019-09-10T20:26:17Z. The update package is 217.46 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: b1195f963cf00e3ead54ca4829eddd6d76e1659d.zip.