Just in case you don't get a response. The update is for win 8 and 3 other updates. My extreme 7 x79 had the same update for win 8, had no problems running 7 or 8.
You can contact ASrock, and see what they say. I have seen people say here that no one gets back to them, so this is why I just wanted to post something.
Can't hurt to flash to 2.10, I have three options for flashing, just checked and you have two, I would use the other one of what you used.
So you send an email to ASrock, not sure what they say, but no matter what, if you don't get help, you can buy a new BIOS chip and have them put what version you want on it. $10-18.00
I don't see older then 2.10, but there might be a chip with older out there. Good luck with it and I hope it works out for you.