iOS 12.1 (build 16B5059d) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2018-09-18T17:20:25Z. The update package is 516.41 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: a1dd4063162a31fced0057ddab0b98dbb45a3619.zip.