iOS 12.0 (build 16A5357b) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2018-08-15T17:06:57Z. The update package is 1.21 GB. This is a delta (partial) update that requires 11.4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 77cb6e85a6aef9733ff165be935efa0213a9012d.zip.