iOS 11.3 (build 15E5189f) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2018-02-20T18:06:24Z. The update package is 346.54 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: b8dd3a7f7f2ac3fde9cee9297f5cdcc94dab5fb3.zip.