iOS 10.2.1 (build 14D23) is an official Apple over-the-air update for the iPhone 5 (GSM), released on 2017-01-09T17:55:53Z. The update package is 32.94 MB. This is a delta (partial) update that requires 10.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 644f434fc24f7555a67724c8c4669520627883bf.zip.