iOS 12.3 (build 16F5129d) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2019-04-08T17:04:59Z. The update package is 453.45 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: 1e89db96fe340a7d05edb2285da93a3427f4a46a.zip.