iOS 12.1 (build 16B5089b) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2018-10-22T17:01:53Z. The update package is 569.07 MB. This is a delta (partial) update that requires 12.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: de4acb460f8c203b2e9dc8a382108de3792ed62e.zip.