The CM390 does not typically ship with a CD driver due to modern obsolescence. Users must download the driver manually.
As of 2025, UGREEN has released three major driver updates for the CM390:
UGREEN has committed to supporting the CM390 until at least 2027. You can find the latest drivers by bookmarking their official support page. Do not rely on Windows Update for future driver updates; manually check every 6 months. ugreen bluetooth 5.0 usb adapter cm390 driver
If you see any yellow warning triangle, the driver is missing or corrupted.
Warning: Do not download drivers from third-party "driver update" websites. They often bundle malware or outdated files. Always use official sources. The CM390 does not typically ship with a
A common myth is that Windows 11 "just works" with all Bluetooth 5.0 adapters. While the CM390 will pair devices using the Microsoft driver, you lose the following without the official UGREEN/Realtek driver:
Benchmark result: In third-party tests, the UGREEN CM390 with the Realtek driver achieved 1.8 Mbps file transfer speed, while the Microsoft driver capped at 800 Kbps. UGREEN has committed to supporting the CM390 until
Microsoft includes native Realtek Bluetooth 5.0 drivers in Windows Update. Upon first insertion:
If it is working correctly: You will see the Bluetooth icon in the system tray, and you can pair devices directly via Settings > Bluetooth & devices.
If it is not working automatically: Do not panic. Windows Update may have been disabled, or your specific build lacks the driver. That is when you need the manual driver.