I had an bluetooth audio device (Bose SoundLink Wireless Mobile speaker) remembered on my MacBook Pro running OS X 10.8.5. Now I don't have it anymore and I want to link it with another audio device and it seems to be unable to forget the Bose one and link with my current device, how could I erase the Bose device?
In extreme situations sometimes the options mentioned so far do not work. If you are having troubles removing the device you can delete
and reboot. This will remove all bluetooth devices and you can then add the ones you want back by pairing them again. I wouldn't recommend this option if you don't understand clearly how to delete the file and how to pair devices. In other words, don't do it unless you know what you're doing.
Using the terminal:
sudo rm /Library/Preferences/com.apple.Bluetooth.plist && sudo shutdown -r now
Go to System Preferences > BlueTooth and you will have a list of the devices remembered by the Mac. When BlueTooth is on you can select one and then at the right of the selection will be an 'X' icon. Click on it and the item will be removed from the list. For reasons that escape understanding you can only do this when BlueTooth is on.