iPadOS 11.4 (build 15F5077a) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2018-05-14T17:16:59Z. The update package is 247.28 MB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a7041d8599aff1fc89670ab4d24b20e316741784.zip.