iOS 12.0 (build 16A366) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2018-09-12T19:10:30Z. The update package is 1.67 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: 943a9e949f63a2f369d7c5f7743647007ee5451f.zip.