I know this guy doesn't steal his services
http://www.cableforum.co.uk/board/12...they-done.html
I know what your getting at with the TFTP
Some reading for you:
www.adamsglobal.com/FileUploads/Firmware1.pdf
http://www.cablelabs.com/specificati...I06-080118.pdf
Still no proof that the OP is using a clone