Hello people, I have one problem with this mobo, after bios update. The PC not power. Just power for 1 second the LED of the cpu on "EZ PANEL" the fans are runing... I see that some B450 have the "flasback+" but I think this, don't have any button. I try to put in usb the firmware and insert in rear usb, without result. Please can anybody help me? link to thread of bios mod Thanks.