If you don't need the update, it's better to leave well enough alone. With a bad flash, you'll end up with a useless, out of warranty, paper weight.
Go to shuttle's site and read the instructions closely. Then read them again. Then go to a couple of other motherboard makers and read their proceedures for reference. You can't be too careful doing a flash. If any of that looks deeper than you can handle, then don't do it.