iPadOS 12.1 (build 16B5059d) is an official Apple over-the-air update for the iPad mini 4 (Cellular), released on 2018-09-18T17:20:08Z. The update package is 341.3 MB. This is a delta (partial) update that requires 12.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6efe7a34d25d52a69e1eb620a040e3b931c0b636.zip.