iOS 12.3 (build 16F5139e) is an official Apple over-the-air update for the iPhone 6s+, released on 2019-04-22T17:09:00Z. The update package is 414.53 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: 246bb3e36c565aa5e51326915ede552cefe3dbf3.zip.