Just wanted to update this post. I got a new DZ68DB motherboard through warranty, the shop I got it from tested it and said the motherboard was dead. So, before installing windows I tried to update to 0042 (the mb had 0040) through F7 and thumbdrive procedure, but the update failed AGAIN! Something really wrong with this motherboards bios update mechanism. I had flash delay on and did everything according to instructions, but the system shutdown in the middle of the bios update. Took it to the shop again
This problem is occurred on my Intel DZ68DB. I had RMA and got the replace motherboard. I'd updated via "F7" again still failed again. Then RMA again try 3rd Intel DZ68DB, it's still failed.