iOS 12.1 (build 16B5059d) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2018-09-18T17:20:20Z. The update package is 402.26 MB. This is a delta (partial) update that requires 12.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8e21cb543ff3b0880b6b8bff399252da6295923c.zip.