The UGREEN CM390 is a tiny, low-profile USB Bluetooth adapter. Key specs:
Users love this dongle because it plugs flush into a laptop or desktop, but the installation process can be finicky.
How do you know you are done? A successful CM390 driver install looks like this:
Before you give up on your UGREEN CM390, run through this final checklist:
☐ Physical port: Avoid USB 3.0 ports (blue inside). Use USB 2.0 (black/grey). USB 3.0 emits radio noise that kills Bluetooth 2.4GHz signals. ☐ USB Extension cable: If the dongle is plugged into the back of a metal tower PC, use a short USB 2.0 extension cable to bring the adapter into open air. This doubles range. ☐ Disable onboard Bluetooth: If your laptop has built-in Bluetooth, disable it in BIOS or Device Manager. Two active Bluetooth radios will conflict. ☐ Run the official UGREEN tool (Method 4) even if Windows says the driver is installed. It cleans orphaned registry keys. ☐ Restart, don't shut down. Windows Fast Startup often prevents Bluetooth drivers from loading correctly. After install, do a full Restart (not Shutdown + Power on).
To understand the driver requirements, one must first identify the underlying silicon. While branded as UGREEN, the CM390 utilizes a reference design based on the Realtek RTL8761B chipset.
The OS identifies the device via its Vendor ID (VID) and Product ID (PID). For the CM390, these identifiers typically map to Realtek generic identifiers (e.g., VID_0BDA&PID_8771). The complexity of installation often arises when the operating system attempts to match these IDs against its generic driver library, frequently resulting in a "Bluetooth Dongle" error or limited functionality.
If Windows does not automatically install the driver, you have two options:
With the correct driver installed, the CM390 demonstrates the capabilities inherent to the Bluetooth 5.0 standard:
Cause: Windows loaded a generic Microsoft driver instead of the Realtek driver. The generic driver recognizes the USB device but cannot turn on the Bluetooth radio. ugreen bluetooth 50 usb adapter cm390 driver install
Fix:
Elena had been staring at the little silver UGREEN CM390 for an hour. It sat in the USB port like a tiny monolith — plugged in, lights blinking, but her Bluetooth speaker stayed silent.
She’d bought it after her laptop’s internal Bluetooth died. “Plug and play,” the box promised. But the speaker only hummed with static, and her wireless mouse refused to click.
Frustrated, she opened her laptop, navigated to Device Manager, and found the culprit: a yellow exclamation mark beside “Unknown USB Device.”
“You’re not unknown,” she whispered. “You’re a CM390.”
She pulled up UGREEN’s site on her phone and found the driver buried under “Support → Drivers → Bluetooth 5.0 Adapter (Realtek).” Her fingers flew across the keyboard: download, extract, run as administrator. The installer flickered, asked for a restart, and she complied.
When the desktop reloaded, the Bluetooth icon in the taskbar was solid.
She clicked “Add Device.” The speaker appeared instantly. Music flowed out — crisp and clear.
Her mouse jumped back to life.
Elena leaned back, glancing at the tiny silver adapter. “Took your time,” she said.
It blinked once, in what she chose to believe was a wink.
UGREEN Bluetooth 5.0 USB Adapter (Model CM390) is a compact dongle designed to add high-speed, long-range wireless connectivity to PCs. While newer Windows versions may handle it automatically, a manual driver installation is often required for full compatibility on Windows 7, 8.1, and 10. device.report 1. Driver Installation Methods You can install the drivers through two primary methods: Official Website (Recommended): Navigate to the UGREEN Download Center Search for product model Download the ZIP file containing the Realtek Bluetooth Drivers Extract the files and run Provided Driver CD: Insert the CD into your computer's drive. Locate the folder corresponding to the and double-click to begin the UGREEN installation wizard 2. Step-by-Step Setup Guide UGREEN CM390 Bluetooth 5.0 USB Adapter User Manual
To install the UGREEN Bluetooth 5.0 USB Adapter (CM390)
, you can often rely on Windows automatic setup or manually download the official driver using product code 80889. Quick Setup Steps
Plug in the Adapter: Insert the CM390 into a free USB port on your PC.
Wait for Windows: Windows 11, 10, and 8.1 usually recognize the adapter and install the necessary drivers automatically within a few seconds.
Check for the Icon: Once installed, a Bluetooth icon should appear in the lower-right corner of your taskbar. Manual Driver Installation
If your computer doesn't automatically install the device, use one of these manual methods: Official Website (Recommended): Go to the UGREEN Download Center. Search for product model 80889. The UGREEN CM390 is a tiny, low-profile USB
Download and run the driver file, then restart your computer when prompted.
Driver CD: If your package included a CD, insert it, locate the setup.exe file, and double-click to install. Troubleshooting Common Issues
Disable Built-in Bluetooth: If your laptop already has Bluetooth, it may conflict with the UGREEN adapter. Open Device Manager, find the built-in Bluetooth, right-click, and select Disable device before plugging in the UGREEN adapter.
LED Indicator: The adapter features a LED that flashes during pairing and stays solid when successfully connected.
Pairing Devices: To pair a device, double-click the Bluetooth icon on your taskbar, select Add Bluetooth or other device, and ensure your peripheral (e.g., headphones, mouse) is in pairing mode.
To set up the UGREEN Bluetooth 5.0 USB Adapter (CM390), you must install the specific Realtek driver to enable features like EDR (Enhanced Data Rate) and stable multi-device support. While some Windows versions might attempt a basic "Plug and Play" setup, a manual driver installation is strongly recommended to ensure full compatibility with devices like headsets, game controllers, and keyboards. Preparation and Driver Retrieval
Before you begin, ensure you have the correct driver for your operating system (Windows 7, 8.1, 10, or 11). Option 1: Official Website Download (Recommended) Navigate to the UGREEN Download Center.
Search for the product model number 80889 (this is the specific SKU for the CM390).
Download the ZIP file containing the Bluetooth 5.0 Adapter Installation package. Option 2: Installation CD Users love this dongle because it plugs flush
If your package included a mini-CD and your PC has an optical drive, you can use the files located there. Step-by-Step Installation Guide UGREEN CM390 Bluetooth 5.0 USB Adapter User Manual