In the early morning of December 11th, Apple officially released the beta version of the iOS 12.1.2 operating system developer. The version of the beta build version released this time is 16D5024a. If you have a developer account, the full firmware package for this beta system is available for download through the Apple Developer Center.
The update details of this iOS 12.1.2 Developer Beta 1 beta system are temporarily unknown. However, it should also be a repair and improvement of the regular bug, optimize the stability and fluency of the system version and so on.