iPadOS 12.1.3 (build 16D5039a) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2019-01-10T18:08:36Z. The update package is 222.88 MB. This is a delta (partial) update that requires 12.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: cf715671394fbab3cf33bc61e6f9602e2ab220fd.zip.