How to Uninstall and Reinstall Bluetooth on a Mac

Click the Apple icon in the upper-left corner of the menu bar on the desktop screen. Select 'System Preferences' from the drop-down menu.
Double-click the 'Bluetooth' icon in the Hardware section of the System Preferences window. Click the device you wish to remove in the sidebar of the Bluetooth window to highlight it. Click the '-' button to remove it.
Turn on your Bluetooth device. Click the 'Set Up New Device' button. The setup assistant will scan for any Bluetooth-enabled devices and display them in the discovered list. Click your Bluetooth device in the detected devices list. Click 'Next' to proceed with the device setup.
Type the pass code displayed in the Bluetooth assistant if you're pairing a Bluetooth keyboard, or simply click 'Done' in the setup assistant to confirm the device and finish the setup.
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