iOS 12.3 (build 16F5156a) is an official Apple over-the-air update for the iPhone 6s+, released on 2019-05-10T17:09:50Z. The update package is 47.17 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: a8065472f9a0d6a5e5c795f8af9b92578bcaa0e8.zip.