Ugreen Bluetooth 50 Usb Adapter Cm390 Driver Install [2021] ⇒

Here’s a complete content guide for installing the driver for the UGREEN Bluetooth 5.0 USB Adapter (Model: CM390).

You can use this for a blog post, help desk article, user manual, or FAQ section.

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.

Method 2: The "Realtek" Truth (The Driver you actually need)

Here is the secret UGREEN doesn't print on the box: The CM390 uses a Realtek chipset (usually the RTL8761B). You do not need "UGREEN software" – you need the Realtek Bluetooth driver. ugreen bluetooth 50 usb adapter cm390 driver install

Step-by-step manual install:

Download the driver. Do not go to a sketchy third-party site. Go to the official UGREEN support page or use a trusted repository like Microsoft Update Catalog. Note: As of 2024/2025, the safest bet is downloading "Realtek Bluetooth Driver" directly from your PC manufacturer's support site if UGREEN's site is down.
Extract the files. It will likely come as a .zip folder.
Install via Device Manager:
- Right-click the Start button and select Device Manager.
- Look for Other devices > "Unknown device" (it will have a yellow exclamation mark).
- Right-click it > Update driver.
- Select Browse my computer for drivers.
- Navigate to the folder where you extracted the drivers.
- Click Next.
Reboot. Restart your PC.

📀 Method 2: Manual Driver Install

Download the official driver from UGREEN’s support page:
Search “UGREEN CM390 driver” → look for “Realtek Bluetooth 5.0 driver (2024 or later)”
Unzip the file and run Setup.exe as administrator.
Restart your PC.

Part 6: Verifying a Successful Installation

How do you know you are done? A successful CM390 driver install looks like this: Here’s a complete content guide for installing the

Device Manager: Shows "Realtek Bluetooth 5.0 Adapter" under Bluetooth (no yellow exclamation).
System Tray: The Bluetooth icon is white and functional.
Range: You can walk at least 10 meters (30 feet) from your PC without disconnecting.
Speed: Transferring a file between your phone and PC takes seconds (Bluetooth 5.0 vs 4.2 is roughly 2x faster).

Problem 3: Driver Installs, but Can't Find My Headphones

Cause: The CM390 uses a hideable boot mode. Some apps (like Bluetooth tray apps) hide audio devices.

Fix:

Right-click the Bluetooth icon in system tray > Show Bluetooth Devices.
Click Add Bluetooth Device (do not use the "Add Device" inside Settings > Devices).
Ensure your headphones are in pairing mode (flashing red/blue).
If still hidden, go to Device Manager > View > Show hidden devices. If the headphones appear grayed out, remove them and re-pair.