Look for an entry like "Intel(R) Wireless Bluetooth" or "Realtek Bluetooth Adapter".
If Device Manager shows Bluetooth entries named "To Be Filled By OEM" or your Bluetooth is missing/not functioning after an update, that usually means Windows doesn’t have correct vendor information or the proper driver/firmware is installed. This post shows safe, practical steps to identify the problem and restore working Bluetooth on a Windows 10 64-bit PC. to be filled by oem bluetooth drivers windows 10 64 bit new
Using outdated or incorrect Bluetooth drivers leads to several problems: Look for an entry like "Intel(R) Wireless Bluetooth"