iOS 11.2.6 (build 15D100) is an official Apple over-the-air update for the iPhone 6s, released on 2018-02-19T21:14:26Z. The update package is 446.84 MB. This is a delta (partial) update that requires 11.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c98c409c9dafe3bcaaad13e2ee8e4b3890f39d8b.zip.