iOS 12.3 (build 16F5129d) is an official Apple over-the-air update for the iPhone 6+, released on 2019-04-08T17:05:09Z. The update package is 379.36 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: 8ca9c5f24b2fe86b3be55c19f059f0d477f523d6.zip.