iOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2018-10-30T17:17:58Z. The update package is 1.46 GB. This is a delta (partial) update that requires 11.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f8b3a27932fd0aa49a32fbfab2a5bf5874171511.zip.