iOS 12.1 (build 16B5077c) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2018-10-09T17:05:43Z. The update package is 369.37 MB. This is a delta (partial) update that requires 12.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: dc9cc2c8efcba0421155e11dafb3c9b00dcca4ff.zip.