Hello, I have the Z170X Gaming GT with the F6 BIOS. This morning I tried updating the BIOS to F20, but couldn't do it. I tried using @BIOS several times and never worked. I turned off all of my anti-malware and anti-virus protection and closed all programs too. I did update @BIOS before I started. Don't understand the problem, I ungraded to F6 with no issues. Any ideas/help would be appreciated. Thanks.