Quote Originally Posted by greenman [ Login above or register to see download links. ]
This is quite often a USB cable problem.
You must use an original quality USB cable and not a thinner charging cable.

Also try a different USB port on your pc and do not connect through a USB hub.

If not that, can you post a link to the firmware you are trying to install.
You have saved my life, I plug another cable, then successful. Thank you.