Laptops with built-in Bluetooth will conflict. Go to Device Manager > Disable the internal Bluetooth adapter (usually Intel or Qualcomm).

Do you know the of your specific E-UB5 model (Realtek, Broadcom, CSR)? Share public link

Before downloading external files, let Windows attempt to find the driver. Plug the E-UB5 dongle into a USB port.

Use a USB 2.0 port if possible, as some CSR dongles struggle with USB 3.0 ports.

Better pairing with Bluetooth 4.0+ low-energy devices. Faster File Transfer: Stable data transfer rates. How to Download and Install E-UB5 Drivers

Ensure you have installed the full Realtek driver package instead of the bare-minimum Windows driver.

Bluetooth 4.0 (with optional 4.1/4.2 features via firmware update)

Often based on the Realtek RTL8761B chipset, which is known for its stability and low power consumption.

If you have installed the driver but the dongle still does not work, follow these troubleshooting steps:

Periodically check Windows Update under Optional Updates to see if a newer, more stable driver version has been released for your wireless chipset.