HarmonyOS developer Beta version for Huawei phones is expected to open on December 18th (tentative)，Early 2021 will open some mobile phone users upgrade HarmonyOS system，Initial upgrades will be validated for months and will soon be fully liberalized。
At Huawei HDC developer conference this year, Mr Yu announced open source roadmap for HarmonyOS :
September 10th opened for memory 128 KB~128 MB terminal devices.
Open for 128 MB-4GB memory terminal devices in April 2021.
In October 2021, it will open to all devices above 4GB.