iPadOS 12.0 (build 16A366) is an official Apple over-the-air update for the iPad 5 (WiFi), released on 2018-09-12T19:06:52Z. 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: d36e8a59d19c77e5bda3c7ad93a6056382d3d719.zip.