The beta is currently only available in China, but it should reach other countries soon. The new software can be downloaded on the whole Mate 20 series, Huawei Mate 20, 20 X, 20 Pro and RS Porsche Design. Interestingly, there is no way of opting out of the beta; once you download EMUI 9.1 you have to stick it out until the end of the tests. Hopefully the program is working fine. Among many changes included in it are increase in performance and responsiveness, better root software, GPU Turbo 3.0 support, new icons & other graphical enhancements.