iOS 9.3.4 (build 13G35) is an official Apple over-the-air update for the iPhone 4s, released on 2016-08-04T17:07:41Z. The update package is 856.2 MB. This is a delta (partial) update that requires 8.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 612f3a7f57908fbf0e5cbf0bbb7fd58eb161b7ea.zip.