I'm not the most experienced guy on here, but one of my most consistent messages is not to flash the BIOS, or do it as the very last resort. As you found, it often causes more problems than it fixes -- and sometimes, you can't roll back once you've done it!!
I know why people do it, sometimes -- they've updated drivers, so they figure, update the BIOS. No -- please don't. Too much of a chance of getting this
instead of this
.
I'm glad you were able to roll back, and we thank you for letting us know the solution.