It’s based on the December 2019 Security Patch Level that you can download and install right now. Though you can wait for the OTA update which may arrive within a few weeks or so. The update is currently available in China, so keep that in mind.
Check OTA Update
Go to the device Settings -> Software update -> Download Updates on your phone. If you haven’t got the update notification yet, you can manually install the firmware. Make sure that those have already applied for the One UI 2.0 Beta program, will get the stable update very soon. If there is no update showing on your device, then wait for few days for the update to come to your device as it is being released phase-wise manner or you can manually flash the full firmware using Odin Flash Tool.
Download A3050ZCU2BSL8 Firmware:
Currently, the Android 10 stable firmware over-the-air (FOTA) update is available for the Galaxy A30 Exynos variants which are also known as the global variants. We have provided the download links below.
Download (sammobile)
Note: You can download any Galaxy firmware using Samfirm Tool, Guide: Download Latest Galaxy Firmware using SamFirm Tool
Odin Flash Tool
Check sammobile website to get the latest firmware for your device
How to Flash Stock Firmware on Samsung Galaxy Devices
How to Install Samsung Stock ROM via Odin Tool
Now, you can easily install or upgrade your Galaxy A30 variant to the stable Android 10 update. You can comment below on any issue.