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#11
I have never, ever had any issues flashing a BIOS, but I've always used the DOS method since it's the safest and most reliable. I have flashed a BIOS with firmware updates around 40 times or so over the past 10 years.
I use an external floppy drive to do it with these days. Now with Gigabyte motherboards they have a feature in the BIOS itself to do it from there and that works very well too.
The secret is to not interrupt the BIOS Flash and make sure the power doesn't go out either. Yes, you can revert back to the previous BIOS and you should be good to go.
Many times a BIOS firmware update is needed, especially since the release of Windows 7 and such.