https://wccftech.com/how-to-downgrade-ios-11-2-to-earlier-firmware-on-iphone-ipad-ipod/

Here’s how you can downgrade iOS 11.2 to earlier firmware, such as iOS 11.1, iOS 11.1.1, iOS 11.0.3, iOS 11.0.2, iOS 11.0.1.

Apple, at a very, very odd time, released iOS 11.2 download for the masses a while back. The update brings with it several cool new features such as 7.5W fast wireless charging as well as Apple Pay Cash. But like every other iOS release, some might not find the update in good taste for several reasons. If you are looking to downgrade iOS 11.2 to an earlier version of iOS 11 right now, then simply follow the steps outlined below.