I recently completed a new build with the AMD Ryzen 7 2700X and an Asus ROG Strix X470-F motherboard. The newly built system won't POST!! I talked to Asus customer service and they told me the problem was with the BIOS and they sent me to AMD. Not sure why I should be talking to AMD but here I am. How can I update my BIOS when my build won't post???