iOS 11.1.2 (build 15B202) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-11-16T21:20:33Z. The update package is 1.06 GB. This is a delta (partial) update that requires 10.3.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 54ccff30814c05bf84093640fd0e6a41a3254a59.zip.