“Serial number is already registered" or "The serial number does not exist"?

Please go to official website  http://www.foxwelltech.us/ and check if your tool should register via FoxAssist or FoxScanner.
If you choose the correct update tool but still have this problem, please send the product serial number and model to sales@foxwelleshop.com with a brief explanation of the problem you have. We will get back to you as soon as possible.