Ah, previous downloads didn't give me anything new, they must have been slow in updating their website.
I don't know about the unlock code, I think it's possibly something to do with your mobile provider, not the device.
If you go to Settings/Option/Profile Management, do you have an access number? If in the Settings/Diagnostics page there is no listing for the network/SIM etc, that means you haven't been registered with your service provider.