Originally Posted by John Clark
507 simply means no OS on the device and that it's ready to load a new OS. Most of the issues you describe are computer/USB port issues. Try a different port. Do NOT use a hub but connect directly to the PC. Disconnect any other USB devices you may be using, i.e. printers, scanners, mice, etc. Then try again. If all else fails, try a different computer.
Thanks John, I will try that this coming weekend. I hope it works. Thank you again