iOS 11.2.6 (build 15D100) is an official Apple over-the-air update for the iPhone 5s (GSM), released on 2018-02-19T21:13:44Z. The update package is 1.03 GB. This is a delta (partial) update that requires 10.3.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 451299153e49b41e54509b219f504386adec71c6.zip.