iOS 11.0.2 (build 15A421) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-10-03T17:03:28Z. The update package is 1.05 GB. This is a delta (partial) update that requires 10.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a57abfc50239f26f2f5a6742e1572d13f770ea7d.zip.