iOS 11.1.2 (build 15B202) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-11-16T21:20:34Z. The update package is 40.14 MB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0aea6a30f8eec7febdfbb23bb66fecb0b018495a.zip.