iPadOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPad 5 (Cellular), released on 2018-10-30T17:06:27Z. The update package is 381.26 MB. This is a delta (partial) update that requires 12.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 98165c155f115516e6ec175928c2c4815d929b55.zip.