In the same spirit, I had for months been waiting for a friend of mine to give me an appointment of the one Saturday that we were to undertake the same procedure 'cause my V7 Combo has been hanging and rebooting for quite some time..... I texted asking him whether he had settled for one but got no response.
That gave me the thought of looking for an alternative and I embarked on searching for how to hard reset my toy and was assisted with a link where I got that same tool that Cheupec used.
By God's grace my PC has RS232 port.
I used three strands of wire, crossed 2 and 3 as indicated, first round nothing, all gray. I tried again nothing....
I looked closely on the PC's port to countercheck my connections and there was the issue. I had counted from pin 5 as 1 onto 1 as 5.
I counted well and hooked my wires onto 2, 3 & 5 and hit on Start and voila! transfer started and I successfully was able to reset, upgrade and continue watching.
After succeeding I thanked my friend for failing to respond to my text for I may not have known how to do it had he set a day to assist me.
He was out of our borders though......