I have a Samsung NP530U4C, that originally came with Windows 7, so in MBR mode. Then installed windows 8 still in MBR mode. Now, after seeing that UEFI BIOS problem in these notebooks was solved, I installed windows 8.1 from scratch in UEFI mode. Erased HDD, converted to GPT, installed with all the correct partitions (windows does that automatically) and voilá. Everything is working fine, no problems whatsoever. I have a legit Windows 8.1, so no problem in activating it. But the other day I tried to access BIOS hitting F2, to change a boot order, and I can't enter BIOS that way. Tried then the Windows 8 way, pressing shift while rebooting, entered recovery mode, but when I go to the UEFI Firmware Settings button, it isn't there. So, I'm having a hard time entering BIOS. Not that it's that important for now, but what I really wanted to know is why isn't there a "UEFI Firmware Settings button..."? Is it something that comes only from factory? Like its embedd in samsung windows image/instalation? I thought it would be a windows feature, available to all UEFI compatible computer. Is there anything I can do to enable that menu? I tried re-flashing BIOS, but still no go... I can't post an image or link to show you which button is, but I guess you know what I'm talking about.