I bought a xps 15 from a guy on offerup. The laptop is great. It is powerful and slim but I have a few problems with it. First of all, Dell doesn't recognize the laptop. When I put the Service tag or the express number, it doesn't find a device. In addition, on the support app, it can't find my warranty either. The weirdest problem is that the laptop shows that It has CPU0000. Could it be that maybe I found an engineering sample of the laptop?