iOS 12.1 (build 16B92) is an official Apple over-the-air update for the iPhone 6, released on 2018-10-30T17:16:49Z. The update package is 1.73 GB. This is a delta (partial) update that requires 10.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1202d52c1135cfa81708e0bb1abc57b08e08f1d5.zip.