I expect this won't be of any help but just in case:
First of all, item must be plugged directly to the motherboard without using USB hub. Secondly, download and unzip firmware file from web site then double click [upgrade_M6900] file to proceed updating. During update procedure, do not disconnect mouse. If failed, reconnect mouse and try again.
If you are still having problems I would suggest contacting GGTS next.
Just enter your email address and click on the language of choice.
GGTS
http://ggts.gigabyte.com/Please expect several days for a reply.