iPadOS 11.3 (build 15E5178f) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2018-02-06T18:20:59Z. The update package is 268.31 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: e24563a16bd73e752639cdd7c49878d4018c0395.zip.