HarmonyOS 2.0 Beta can be delivered to those devices Over The Air, if you can sign up on this page (note: it's in Chinese). If approved, you will receive a confirmation email and the update will be pushed to your phone or tablet a couple of days after that. You will find installation instructions on that page as well.
Just don't expect the UI to look all that different – Harmony and EMUI share a lot of code. Really, it's what's under the hood that is different. In fact, Harmony can run Android apps just fine. If you're curious to see the OS run on real hardware, here it is installed on a Huawei P40.
Huawei isn't relying on just Android apps, however. It announced a developer competition with awards totaling CNY 1.5 million ($230,000) for new apps for Harmony. The company released an IDE plus an emulator for devs to make testing easier.
Plus, HarmonyOS does include many new features. A core design idea for the OS is to power what Huawei calls "Internet of Everything", meaning the UI needs to adjust to many different screens (phone, tablet, car and so on). To that end, developers can use over 50 highly-adaptable Distributed UI controls.
The phones that are supported currently are: Huawei P40, P40 Pro, Mate 30 (and the 5G version) and Mate 30 Pro (and its 5G version). One tablet can install the new OS too, the Huawei MatePad Pro (Wi-Fi and LTE models, plus the 5G one).
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