@ manu_b,
Since more than 20 days has elapsed since you posted, is this still an issue?
In these cases, I would suggest returning to the retailer for assistance. If brick and mortar, they might be willing to assist you with using an older CPU for troubleshooting or flashing. If purchased on line, you have the option to return/exchange. If you utilize Gigabyte for assistance, I'd check to see what local support options are available to you.