iPadOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad Pro 12.9-inch (WiFi), released on 2017-12-13T18:09:53Z. The update package is 333.91 MB. This is a delta (partial) update that requires 11.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 83eefdb41c137a926fb423e96f379ca901dcebd4.zip.