How do I use an External USB Bluetooth Module?
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If your Mac does not support BTLE you can use an external USB Bluetooth Module.
Luckily that is pretty easy to resolve with an inexpensive external Bluetooth device like IOGEAR Bluetooth 4.0 USB Micro Adapter
When you install the external Bluetooth device, you may need to force the system to be able to recognize it and switch the Bluetooth stack to using it. The way to do that is to run the following command in terminal:
sudo nvram bluetoothHostControllerSwitchBehavior="always"
You may need to remove and reinsert the USB module or restart your computer. To verify that you are using the new Bluetooth hardware, check your system information and make sure that your `LMP-version` is `0x6`.