This is the wrong subreddit for this but usually if you go to the support/drivers section of the manufacturer’s webpage for your mobo you can find the latest bios. Often it will include a tool to flash it from within windows so you don’t need to use a USB.
Put it up on your local classifieds site for free, with the stipulation that it all comes as a bundle. It’s not worth the effort to sell but at least this way it doesn’t go in the trash.