iOS 10.2.1 (build 14D27) is an official Apple over-the-air update for the iPhone SE, released on 2017-01-23T18:08:41Z. The update package is 1.06 GB. This is a delta (partial) update that requires 9.3.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 21d36c484319f66e069c4f5d4ee2e5924d058290.zip.