UEFI version 2.30 for your board has been available for two weeks, and this is the first time anyone has posted about a boot or SATA problem with your board. The only thing SATA related stated in the UEFI updates is the Intel RAID Option ROM was updated in version 1.90. My Z77 EX 4 board has a UEFI update with the new Intel OROM, and that caused no problems for me.
The obvious thing is a new setting in the UEFI, or a change in a default setting caused by the UEFI update is the problem. What that exactly is, if correct, I don't know. Did you check all the UEFI settings, particularly the SATA Configuration, after the UEFI updates? I notice you are using Vista, what SATA mode and driver do you use with the Intel SATA chipset?
Do you have the ASMedia SATA controller disabled, since you don't use it? No specific reason I mention that beyond it is a SATA controller that is initialized during POST.



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