iOS 12.1 (build 16B5089b) is an official Apple over-the-air update for the iPhone SE, released on 2018-10-22T17:02:10Z. The update package is 134.67 MB. This is a delta (partial) update that requires 12.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 390cef88483bfcf748f12b05390d5687214543cd.zip.