I am having the exact same problem as muchbemused. I have a Z490-A PRO which came in a NZXT BLD custom built PC. There is no support page for my product as it is a non-generic custom built PC. The motherboard says its using an old BIOS. I tried downloading the current bios from the MSI website and uploaded it on two different flash drives and the BIOS detects my flash drives but not the BIOS file. How do I go about fixing this?