iOS 12.3 (build 16F5117h) is an official Apple over-the-air update for the iPhone 6+, released on 2019-03-27T17:06:25Z. The update package is 328.9 MB. This is a delta (partial) update that requires 12.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6e5908e91e9284d0b39510a1052a2b47ee4d62b1.zip.