i have the hero 690 . Dont no how to update the bios
and wouldn't've dare try something like that..
Your board has BIOS Flashback, same as mine.
I always update BIOS by firstly copying renamed BIOS file onto an empty USB stick formatted to FAT32. Then pressing the CLR CMOS button on the rear IO panel, which turns off the computer.
Then switch off the power supply by the PSU switch.
Place the USB stick into the appropriate USB slot on back IO panel.
Turn on power supply by the PSU switch.
Press BIOS button for 10 seconds on the rear IO panel and wait for flashing light to cease.
Switch off by PSU switch and wait 10 secs then switch on PSU switch and continue to boot PC pressing DEL or F2 to enter BIOS to update your settings.
You may have to follow some on-screen instructions.
I've never had any issues doing BIOS updates this way.