The latest BIOS for your board is actually F6 and you can safely update to this version as it should include the RAID ROM Update.
Well, that was far less painful than I might've been led to imagine.
For folks searching on flashing their BIOS, one piece of information I hadn't found in other threads is that the QFlash utility will allow you to navigate the folder structure on a USB thumb drive. Being superstitious, I had the necessary file in the root, but it could've been anywhere. Also, when asked, I had to pick "Floppy" drive for some reason. This machine doesn't even have one, but that's how QFlash recognized the USB device.
One thing I haven't seen yet is a way to confirm the BIOS rev from within the BIOS? The only apparent indication is during that POST screen, which is fairly well hidden by the advertising logo and/or whizzes by so fast as to actually never really appear. I have found that a hard reset, without the logo, allows me to hit Pause at just the right moment to see the revision. Bit of a hassle, though.
Anyway, I'm at F6, and ready to tackle getting Windows on! Thanks again...