iOS 10.3.4 (build 14G61) is an official Apple over-the-air update for the iPhone 5 (GSM), released on 2019-07-22T17:07:56Z. The update package is 34.7 MB. This is a delta (partial) update that requires 10.3.3 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: 510f3fd40401a3fb35b1a22fa160f9a29730ec0c.zip.