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You need a floppy drive.
If you were to make a bootable CD, not only would you not be able to backup your current BIOS but you would have all kinds of junk loaded in memory that can screw up the flash.
In order to access the root of the CD you would have to load drivers because you couldn't get there though strict el-torito support and the last thing you want is anything loaded from an autoexec.bat or config.sys.
When you flash a BIOS you only want the minimal required files: Command.com, Io.sys, and msdos.sys
Anything else and your taking a chance of killing your board. (IMO).
Best of luck,
Dave
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