We'll I was finally able to update the BIOS. I had the wrong file. My boards is P8Z68-V Gen3 & not P8Z68-V. My bad!!
Now when I set the MB to boot in UEFI mode, the BOOT Device LED glows red. I had this problem before updating the BIOS & I thought updating the BIOS would fix it, but apparently it doesn't. I had been using the MB in UEFI mode for some time with the older BIOS, but suddenly this problem popped-up.
I can boot fine in Legacy BIOS mode. The problem is only with UEFI mode. Does anyone know about this?