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The 8MB file is just a different format of the same firmware image. It's kept with the package in case this package is released to the factory. The update batch file calls the mr_m09p6.rom file and that's the one that should be used in the field.
now i just wonder why when it occasionally lets me into the bios when i go to move my mouse the system freezes and i have to reboot. it allows me to use the keyboard fine just not the mouse. very strange.