iOS 12.3 (build 16F5155a) is an official Apple over-the-air update for the iPhone 6+, released on 2019-05-07T17:04:22Z. The update package is 64.11 MB. This is a delta (partial) update that requires 12.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1c95ec05bf5644d8fd96ef9976066c793a43c1c1.zip.