iPadOS 10.2.1 (build 14D27) is an official Apple over-the-air update for the iPad 4 (WiFi), released on 2017-01-23T18:07:14Z. The update package is 841.14 MB. 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: ffb4e12ec8ef3dd0aa2259b957e213407db2aa1d.zip.