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My friend has a Samsung NP530U3C and he has changed the BIOS to CSM only. Now its stuck on a loop and will not boot up, the options "F2 setup" and "F4 recovery" are there but they do nothing. I have a bootable USB with Windows 8 that "installs" right up to restart, then....back to the loop or install.

How can I get to the BIOS and change it back to EFI/CSM?

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Changing UEFI to legacy BIOS/CSM shouldn't prevent you from entering the BIOS. Are you saying the key to enter the BIOS is completely ignored now? – Karan Jul 16 '13 at 2:48

Another way to enter BIOS is to hold the shift key while you press restart-> troubleshoot->advanced options->uefi firmware setting->restart. when you get into BIOS, go to advanced, disable fast BIOS mode,then go to boot,disable secure boot,and you will have the OS mode selection where you can choose CSM OS.

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I confirm this. Thx dude. – RōŸ Çāłdērōn Feb 7 at 2:28

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