How do you do the code numbers with 7,8,9 in it wen there is only 1-6 to chose from?
Don’t know how it’s done on eurovox head units but on my radio (not Holden), the buttons 1, 2, 3, 4, 5 & 6 represent the position of the security code which in your case is 6 3 8 2. So only 4 buttons need to be pressed.
So try and press radio button 1 six times, radio button 2 three times, radio button 3 eight times and finally radio button 4 two times... hopefully it will then unlock.
If the above doesn’t work, which is highly likely, I
found this doc which states a few different things including lockout mode, and test codes. Also found the following video may help.
I’d also assume buttons 7, 8, 9 and 0 are just a continuation of the buttons from left to right (seek, etc).