I had only performed the update as I was intending making a cheapish system based on this board with the new Rev E6 semprons when I bought a new NF4 MOBO for my 754 AMD64 CPU (which is why I'm not panicking too much).
The fans were p-ing me off so I thought I would revert to the original BIOS I had saved until the update was needed. Set the Flash utility running, left the room for a bit, came back and saw what I thought was the restart now message, hit restart, read the message properly for the couple of seconds it was still on screen and kicked myself for not doing this first. It said something along the lines of 'verification unsuccesful' and now, unsuprisingly, it refuses to boot. I just get constant loud beeps at a rate of about 3-4 a second.
Is there any easy way back from here or do I go and get that new MOBO sharpish!