iPadOS 12.2 (build 16E5181f) is an official Apple over-the-air update for the iPad 6 (Cellular), released on 2019-01-24T18:05:42Z. The update package is 641.5 MB. This is a delta (partial) update that requires 12.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b1ec10297512abd6e14f5425f58504217c495c43.zip.