Am an ex-Nokia employee. This device is a prototype device. It is registered to Nokia/Microsoft and shouldn't be legally sold out to any individual. This device is not even supposed to bring into public's eyes. This must be a stolen device for sure. You should be able to update software's, but the hardware might be the same as production version or few parts might be older test device as it is not the final product. Also you wont get warranty for this device anywhere in the world. Sorry, didn't have time to read other's comment, not sure if someone already guided you better. Try to contact Microsoft reporting the same as you can avoid legal issues (if any) in future. Also report to Ebay about the same mentioning the seller. Not threatening, if Microsoft/Nokia come to know this, they might be able take legal actions as per law as it is a stolen prototype.