As Huawei has more and more cool techs technology, EMUI systems are becoming more and more competitive. Huawei EMUI officially announced last night that EMUI 9.1 is fully open and upgraded! Now, the EMUI9.1 system not only supports Huawei P30 series, Mate 30 series, but also supports ten older models such as P20 series and Mate 10 series.
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https://www.gearbest.com/blog/new-gear/huawei-emui-91-upgrade-fully-open-to-10-more-new-huawei-phones-7011