iOS 9.9.10.3.2 (build 14F89) is an official Apple over-the-air update for the iPhone 6, released on 2017-05-15T17:02:47Z. The update package is 1.2 GB. This is a delta (partial) update that requires 9.3.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9acf6f68f29d8e30d97a5991bf9e36674f6993e5.zip.