iOS 11.1.1 (build 15B150) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2017-11-09T18:11:51Z. The update package is 1.15 GB. This is a delta (partial) update that requires 10.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a4c9db4ecf04673fed5915d5c028bb65430b9581.zip.