A few days earlier Apple had rolled out the iOS 11.2 update and now they have started rolling out the iOS 11.2.1 update. It is not a very big update but it fixes certain bugs and is 70 MB in size. This update is mainly for iPhones and iPads and it has the vulnerability fix. The bug could let a perpetrator help in gaining access to someone’s connected devices (thermostats, and lights etc).
This update also fixes an auto-focus problem that had come after the users had updated iOS 11.2. Users of iPhone 8, iPhone 8 Plus, and iPhone X faced this predicament. They complained that their camera was unable to focus on objects, and for the dual camera, the two lenses shifted in between themselves.
To update all you have to do is go to settings, then General, and then software update. You should have a very good internet connection and keep your phone battery charged up before updating. The iOS 11.2 update has received a lot of complaints from its users since the first day but the iOS 11.2.1 is a great update.