I have got a Windows Phone 8 and am trying to register it with the developer account.
I am using the tool \"Windows Phone Developer Registration\" that comes with Vi
To update - you do NOT need an active SIM for developer unlocking. I purchased a cheap Nokia 520 for device testing and it does not have a SIM at all.
I encountered this error registering my phone, and I had to restart the IpOvrUSBSvc service (it was listed as running, but still didn't work), before the registration was complete.