i don't get this option : "Eventually, you will be asked: Do you want to start update?
Press the volume up button to say yes."
if you didnt get that option it means that for some reason the file did not write to your sdcard,,, reboot the phone, close the program out. make sure HTC sync is installed, make sure your phone is in debugging mode and stay awake, make sure you are using the ports in the back of the computer, make sure your phone is set to charge only. then try the application again from the beginning