Things so easy to fix shouldn't be so difficult to look up.
X2 bios has not ruined the chip, and you can use a flash utility to flash the X3 bios. You are not stuffed.
You also needed to supply more information for people to help, I'm assuming you have a 1.6b by the fact that you had switches on (off on off off) and backup bios does not work.
The only way you can update the backup bios is through the X3 bios.
DJBOOBY has given you more than enough details to do this all.