I haven't visited this site for a while...not a lot of action over here. Does it matter if you reset to factory defaults? Who ever buys it off you will have to download the MIMO app and install it on their mobile phone and figure anybody with the app could use the O-3. Maybe no warranty but that's what you get buying used.
To operate it? Maybe try to have someone download the MIMO app and see if the bluetooth will connect to their phone. Like most BT devices I just thought once connected it will continue to work from the last device. Actually I don't know and I've never tried it.