there is no Chinese version of RNS 510. I believe you indeed have some kind of Chinese wince based 2-din unit which is (on the outside) similar to genuine RNS 510 and it's most likely also branded with VW logo, but this is definitely not RNS 510! There are many variants from china which are similar to original units but they are much cheaper and have different GUI and OS. If I'm' right, than you can install any navigation software which is wince based (preferably iGO) and you can forget all what is related to genuine RNS 510 units which are factory installed in VW cars.
Please provide some pictures of the unit and it's GUI...after that we can discuss further.