iPadOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPad 5 (Cellular), released on 2018-10-30T17:06:26Z. The update package is 1.25 GB. This is a delta (partial) update that requires 11.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4c22c44bc1e6787f4def6f39c7dd4099b6c286df.zip.