iOS 12.3 (build 16F5156a) is an official Apple over-the-air update for the iPhone 6s, released on 2019-05-10T17:09:48Z. The update package is 46.95 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: 082cb06c926dc69e09b7171e8d4428b8db472e47.zip.