Disable any existing Bluetooth drivers in Device Manager and restart the PC.

If you are still having trouble with the adapter, I can help with these next steps: in Device Manager How to properly disable onboard Bluetooth Tips for fixing connection drops

Microsoft's generic driver often limits the adapter to Bluetooth 5.0 features (2 Mbps PHY, LE Advertising Extensions) unless a dedicated vendor INF file unlocks 5.3 features (LE Audio, LC3 codec, Periodic Advertising). This is why UGreen provides a "driver download" on their site – it's actually a custom INF + Realtek firmware loader that tells Windows: "This device supports the full 5.3 feature set."

[Realtek.NTamd64] %RTL8761B.DeviceDesc% = RTL8761B, USB\VID_0BDA&PID_8771 %RTL8761B.DeviceDesc% = RTL8761B, USB\VID_0BDA&PID_A729

Supports connecting up to 5 devices simultaneously (e.g., mice, keyboards, headphones).

Even after installation, problems can arise. Here are the top five errors and their fixes.