iOS 11.2.6 (build 15D100) is an official Apple over-the-air update for the iPhone SE, released on 2018-02-19T21:14:48Z. The update package is 1.09 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: 2fcb90fc6a9cb6731d5a8a395deee8cecaa5c34f.zip.