iPadOS 11.2.6 (build 15D100) is an official Apple over-the-air update for the iPad Pro 12.9-inch (Cellular), released on 2018-02-19T21:13:11Z. The update package is 154.03 MB. This is a delta (partial) update that requires 11.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b2ad99e3086d9544a0378f4722742412bf4f98d0.zip.