November 28, Apple today closed the verification channel for iOS 12.0.1, a version of the system released in early October. This means that a downgrade from iOS 12.1 is no longer possible.
Apple has stopped validating iOS 11.4.1 and iOS 12.0.
In fact, demotion demand has slowed down over the years. First, OTA replaces iTunes as the dominant way to upgrade, second, the appeal of jailbreak is reduced, and third, it is difficult for new equipment to have a perfectly solidified prison escape scheme.
Currently, the latest official version of iOS is iOS 12.1, and iOS 12.1.1 is also entering the third beta.
Compared with iOS 12.0.1, iOS 12.1 official version fixes bugs, improves system stability, and enables eSIM support for iPhone XS, XR, XS Max non-bank (Hong Kong) version, online FaceTime group chat function (highest Support 32 people to chat at the same time), add more than 70 new Emoji expressions, cancel the proactive beauty effect, and add a new real-time depth of field control function.