Strange, it came up asking for a code after the car battery was removed. It did restore things back to normal when pressing and holding the power button.
Phoned car dealer and they seems to think there is a radio code? (At a cost however).
Also pretty sure there was a radio code on a bit of paper which my mother has lost..?
Not saying you are wrong..
Also trying to find the serial number for it as well, this is an android device, the info section doesn't seem to display it.