If your BT-05 features a physical switch, ensure it is set correctly for your needs:
. On laptops with built-in Bluetooth modules, conflicts can arise between the internal hardware and the new USB dongle. Experts recommend disabling the internal Bluetooth in the Device Manager driver bluetooth m-tech bt-05
What are you using (e.g., Windows 7, 10, or 11)? If your BT-05 features a physical switch, ensure
Windows 10 has a built-in inbox driver that sometimes works if you force it. driver bluetooth m-tech bt-05