iOS 11.2.2 (build 15C202) is an official Apple over-the-air update for the iPhone 6, released on 2018-01-08T18:17:58Z. The update package is 504.55 MB. This is a delta (partial) update that requires 11.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: efdb1595ee515a765ed0bcaf92339d1f1ed144f0.zip.