successfully reverted back to 404, using this together with Asus Liveupdate
(1) load the BIOS with Asus Update as usual, remember click "downgrade" option in Asus Update Option
(2) Load the file I uploaded
(3) click the leftmost button
(4) the update button should be un-greyed, then click update, otherwise, repeat Step (3)
(5) after update successfuly, switch off the computer and clear the CMOS as usual
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