This cannot be stressed enough. I know Gigabyte is working on it, but as of now I cannot recommend using it AT ALL.
I have seen so many Boards killed (IE: Bricked, that is your motherboard is now a brick and you will have to RMA your board) by using @BIOS. I would guess that more then 90% of RMA's due to a bad flash, were because of @BIOS alone.
Yes it may work for you once or twice but if you keep using it you will find out the hard way it is not a good idea. Windows based flashing has always been looked down on and likely will never be a accepted or recommended method to flash a BIOS
I have been using it for 6 years on 3 different PCs and 2 laptops. No issues ever. Not to mention the use of it on many clients PCs also built by myself. Not sure what issues your having, it has always been easy to use.
You are about to answer a thread that has been inactive for more than 6 months. If you still wish to proceed, please ensure that your posting is original and does not duplicate or overlap any prior responses to this thread.