Thanks for this tip. I ran out of battery after flashing so many times the defy today!
Was it right to connect one micro sd cable to the phone and usb port and the mcgiver cable to another usb port at the same time?
Hopefully this was not a bad thing for my battery
Damn I got 50% in just a few seconds
/edit
Also the battery % dropped again in seconds to five, but hey I was able to flash my defy again
Now I will let it charge over night and finish the update tomorrow..