iOS 11.3 (build 15E5211a) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2018-03-12T17:05:52Z. The update package is 279.06 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: daf435c81a0ee3392ef9679b60883f0a0f0ce27a.zip.