iOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2018-03-29T17:11:32Z. The update package is 807.21 MB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1af272347da27a5b81d1a9320b0c5fd5ffb13fad.zip.