The company currently has 3000 slots for each device and is already rolling out the first beta update for the Meizu 17 duo.
Those interested can enroll in the beta program by heading to the Settings > System Update menu on their smartphone and fill in the required details. But do note that beta firmware is not as stable as the official builds and may contain bugs that hamper the user experience.
Meizu says you can’t roll back to the stable version once you install the beta update, so it’s best avoided on a primary smartphone.
Source (in Chinese) | Via