High Andy, I finally got mine to update. I followed all your instructions and no joy. I heard the sound when I plugged the Legend into my computer, so I know that was ok, I turned off my antivirus and still no joy. Out of desperation, I rebooted my computer and tried it again and Wala! It updated. So, if all else fails, reboot your computer.
A valid port was not found, thats all i ever get, anyone else get this, doesnt matter what computer, it makes the proper noise too when plugging in that it recognizes, this has been ongoing since i got the machine months back, trying to not to give up but this is rediculous, gonna have to return this machine, i was liking it when it worked good.