Ugreen Bluetooth 50 Usb Adapter Cm390 - Driver Install

Short story — "UGREEN Bluetooth 5.0 USB Adapter CM390: Driver Install"

Evan found the tiny UGREEN Bluetooth 5.0 USB adapter tucked under a stack of manuals like a secret. The silver dongle was no bigger than his thumb, but the label—CM390—felt like the name of a ship about to sail.

He plugged it into his laptop’s lone USB port. For a moment nothing happened; the machine was an indifferent harbor. Then a barely audible chime: a device was detected. Windows spun its wheels trying a driver from its own stores and failed with a polite notification: “Driver not found.”

Evan smiled. He liked small technical quests. He grabbed his phone, typed “UGREEN CM390 driver install,” and skimmed the first result. The official download page promised a packaged driver optimized for the CM390 chipset and a brief guide. He downloaded the zip, eyes on the progress bar like a navigator watching the horizon.

Step one, the guide said: extract and run setup as administrator. Evan followed orders. The installer window opened with unassuming grey buttons and a progress bar that crept forward. Midway it asked whether to allow changes—his laptop’s security asking permission like a customs official. He clicked “Yes.”

Drivers installed. The installer finished and offered to reboot. He chose “Restart now.” When the system came back, the Bluetooth icon appeared in the taskbar like a lighthouse finally lit. He clicked it and started pairing his old wireless headphones. The headphones blinked, the adapter pulsed, and the two devices greeted each other with a chirp—the digital equivalent of a handshake.

Music flowed clean and crisp. Evan leaned back, satisfied. The CM390’s firmware update option in the installer promised better stability; he accepted and let the utility apply the patch. A tiny progress notification climbed slowly, then completed. “Update successful,” it said. Evan felt oddly proud—a small, quiet victory. ugreen bluetooth 50 usb adapter cm390 driver install

Later that night, he moved the adapter to his travel laptop. This time the OS recognized the device automatically and fetched a compatible driver without his intervention. The two laptops, different as they were, now shared the same small secret: a compact dongle that made wired things wireless.

The CM390 stayed in his bag from then on—small, dependable, a reminder that some problems are solved with a little patience and the correct driver. And when friends asked how he made audio so seamless during remote game nights, he would just smile and hand them the tiny silver stick, as if offering a trinket that held a solved puzzle.

The end.

UGREEN Bluetooth 5.0 USB Adapter (Model CM390 / Part Number 80889)

is a plug-and-play device for most modern Windows systems, but it may require manual driver installation for full functionality or older operating systems. device.report Installation Methods UGREEN CM390 Bluetooth 5.0 USB Adapter User Manual Short story — "UGREEN Bluetooth 5

2. Does the CM390 Need a Driver? (The Truth)

Short Answer: Yes and no.

• Windows 10 & 11 (Latest versions): Should install automatically via Windows Update within 60 seconds.
• Windows 7 / 8 / Older builds of 10: You must manually install the driver.
• Linux (Ubuntu/Debian): Usually works out-of-box with kernel 5.0+.
• macOS: Not officially supported. Skip this guide if you are on a Mac.

If you inserted the dongle and see "Unknown USB Device (Device Descriptor Request Failed)" or nothing happens, you need to follow the manual steps below.

8. Windows 11 vs. Windows 10 vs. Linux

2. Hardware Architecture and Chipset Analysis

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.

• Interface: USB 2.0 / 3.0 backward compatible.
• Bluetooth Specification: Bluetooth 5.0 (BLE).
• Chipset Driver Requirement: Realtek USB Bluetooth Driver.

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.

4. Method 2: Manual Driver Install (Realtek Chipset)

If Windows Update fails, you need the generic Realtek driver. UGREEN does not host drivers on their main site (ironically), but the chipset manufacturer does. Windows 10 & 11 (Latest versions): Should install

Step 1: Download the official Realtek Bluetooth 5.0 driver.

• Go to a trusted driver repository (e.g., Station-Drivers or Microsoft Update Catalog).
• Search for "Realtek Bluetooth 5.0 Adapter" or "RTL8761B" .
• Safe link: Use Microsoft Update Catalog (search for "Realtek Bluetooth 5.0").

Step 2: Extract the ZIP file. Step 3: Open Device Manager (Right-click Start button → Device Manager). Step 4: Look for an unknown device under "Universal Serial Bus devices" or "Other devices". It might say "Unknown Device" or "Bluetooth Adapter". Step 5: Right-click the device → Update driver → Browse my computer for drivers → Let me pick from a list... → Have Disk. Step 6: Browse to the extracted folder and select the .inf file (usually rtbt.inf or rtl8761b.inf). Step 7: Click OK → Next. Ignore the "This driver is not digitally signed" warning if it appears (for Windows 7/8).

Step 8: Reboot your PC.

Part 5: Advanced Troubleshooting (Registry & Power Management)

If you have followed all the steps and the UGreen CM390 still disconnects randomly or fails after sleep, you need to disable USB selective suspend.