Nevermind, I used this:
sudo flashrom -v current_image.img to do a comparison between my actual BIOS and the backup file and it was successful, so I thought my BIOS was untouched. I rebooted and it's all OK, my BIOS still works.
I think I'll use the EasyFlash Utility provided in my BIOS to do the flashing, I didn't notice it existed before. I did a stupid thing. ;-)
Thanks!