iOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPhone 8 Plus (Global), released on 2018-03-29T17:11:23Z. The update package is 859.74 MB. This is a delta (partial) update that requires 11.0.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9ae54260e3f72bdb8c0950e54d4833c0b26089ce.zip.