iOS 10.3.3 (build 14G60) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2017-07-19T17:03:38Z. The update package is 78.49 MB. This is a delta (partial) update that requires 10.3.2 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: ac1215e7dd661d6cdf7bb0078753f73d9b260580.zip.