iOS 12.1 (build 16B5059d) is an official Apple over-the-air update for the iPhone 6+, released on 2018-09-18T17:20:21Z. The update package is 428.7 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: 3712645723ac0d879e4a0d146a744856ee7547a9.zip.