iOS 11.1 (build 15B93) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-10-23T17:06:24Z. The update package is 1.12 GB. This is a delta (partial) update that requires 10.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b94fd0718b2ff1ec7757ba82179542c3fed78ef0.zip.