iOS 10.2.1 (build 14D27) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2017-01-23T18:08:45Z. The update package is 341.9 MB. This is a delta (partial) update that requires 10.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: abd33afa511e5ddfb05fab08c5a9719f80d99c8a.zip.