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 414.54 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: 668b5985b73cfc19f0bc7374952eb6d72b48c4b3.zip.