iPadOS 11.4 (build 15F5061d) is an official Apple over-the-air update for the iPad 5 (Cellular), released on 2018-05-01T17:05:48Z. The update package is 257.52 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: 51f87a6f362a37ef8afb9738f98c8564a65de561.zip.