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 341.05 MB. This is a delta (partial) update that requires 10.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 350481e6aae32c657f98437ec5ffd6280c40861d.zip.