Fella's
PLEASE take the time
to get familiar with the tool (Asus Update tool that is

).
I have
NEVER had a problem reverting back to an older BIOS regardless of the version, 601 -> 501 for example. There is an OPTION in ASUS UPDATE that will allow you revert back to an older BIOS. I'm not at my PC at the moment, otherwise I would walk you trough the screens.
Seriously tho, there are not a whole lot of options so it should be an easy find.

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