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an upgrade of my DZ77RE-75K to the latest BIOS (0053) has crippled it. The MB was able to boot to the Windows in the legacy mode after the update. But when I enabled UEFI Boot in the setting it failed to do POST. MB beeps four times and the status code stuck at 0xCB value. BIOS reset by the jumper or hw config changes have no effect.
DZ77RE-75K is a crappy board.