Just downloaded the express bios 0027 for the dz68bc, ran the file, windows restarted, didn't take long and got the message bios update successful but I still have what I started with, 0021. Did I do something wrong? This is a nice board by the way, working well, just thought I should get the latest bios. Thanks.
I had the same problem with my new DZ68BC board. Executed the BIOS update from Windows 8 (developer preview). Didn't work. Revision stayed at v21.
Downloaded the .BIO alternative and upgraded the BIOS by using the build-in flash option (F7 key). I just had to browse to the just downloaded .BIO file (it is actually real cool that the BIOS can read this .BIO file from the NTFS partition, no need to create a bootable usb or a floppy).