iOS 11.0 (build 15A5372a) is an official Apple over-the-air update for the iPhone 6s+, released on 2017-09-06T16:51:08Z. The update package is 37.07 MB. This is a delta (partial) update that requires 11.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 781dbb97dbe462a01910f136e30c1699700b9192.zip.