iOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2018-03-29T17:11:30Z. The update package is 859.77 MB. This is a delta (partial) update that requires 11.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a4c56039fc55e15ecd43375cd012456fdc61b571.zip.