iOS 11.2.1 (build 15C153) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2017-12-13T18:11:03Z. The update package is 593.61 MB. This is a delta (partial) update that requires 11.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9ab48960fdfda230b493d7805248edfe568a4c06.zip.