I have an RCD510 with 9w7 bluetooth unit from Spain...
Sorry can't help you here. Don't have the voice command function/feature and haven't tried software upgrades (not even sure if there are firmware upgrades around). I have a new RCD510 and have just connected up RVC.
I can access my address book either through the RCD510 or through the MFD. I can dial using either. I generally prefer to search on the RCD510 as it's a lot easier. No problems with garbled address book and I have close to 1,000 contacts (mostly work ones) so I don't think the number of contacts is an issue.
Have you tried other phones? It may be an issue with reading the contacts from your phone but it's strange why the MFD works but RCD has issues.
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