When I enter the code the radio displays error, if I try 3 times it goes to off and I have to go through the 2 hour re-set process.
The serial number on the original radio is VO2080 11655175 N
The serial number on the second radio is VO2080 Y8215325 A
If you could find a code for either, I would be obliged.
Here is everything from the radio.
Mae in Japan
The model is HU-605
Hope this helps,