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#11
I have went from old to new and new to old. (As well as on Android smartphones) So for myself I can say its possible. Keep in mind though the normal way of flashing a bios will block it, (to protect users from installing a older version accidentally) but the emergency bios flash from USB drive won't. There is a chip that monitors that port for a button push and whatever is in there it will flash, regardless of what the real bios chip says. Otherwise it would not be a good backup solution would it?
There is 2 chips-the actual bios chip and the bios emergency flashback chip that has the capability to flash the normal read only chip(unless a upgrade in initialized). This allows it so that even when the chip cannot even function, the emergency one can flash it, no matter what state the other chip is in. From my understanding anyway.
This is my board:
http://www.asus.com/Motherboards/SAB...990FXGEN3_R20/
Scroll down to the USB BIOS Flashback section.