What happens if I change my bluetooth address to

(00:00:00:00:00:00)

This address looks pretty nice. And in fact it is possible to change the address of your bluetooth dongle to (00:00:00:00:00:00). But only once. After that Windows Device Manager shows the following error - "Windows has stopped this device because it has reported problems. (Code 43)". And bluetooth doesn't work anymore.

In Linux you get similar error in the syslog:

bluetoothd[...]: No address available for hci0     
or
bluetoothd[...]: No Bluetooth address for index 0  

This happens because bluetooth addresses internally represented by a 64-bit integers and (00:00:00:00:00:00) corresponds to zero, which also has special meaning - no address or some error.

To protect our users we have banned this address in the version 1.3 of Bluetooth MAC Address Changer.

Unbrick tool (Update 21.09.2019)

There is a proof of concept application which can help to fix bluetooth adapter with zero address. The sources are published on GitHub