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How to Set Windows 8 PC to Boot with Legacy BIOS Mode Instead of UEFI ModeWhen your computer is powered on, check the boot-screen for setup key (i.e. DELETE key, F8 key, F2 key) to enter BIOS Setup Utility. In the BIOS Setup Utility, change the boot mode from UEFI mode to legacy BIOS mode (or CSM boot mode), and disable the Secure Boot option. Here are steps of disabling UEFI secure boot in Toshiba laptop:Power on the system and while the “TOSHIBA” logo appears, press F2 key to enter the BIOS Setup Menu.Select Security tab and set the Secure Boot to Disabled. Select Advanced tab and go to System Configuration. Set the Boot Mode to CSM Boot. Press F10 key to save and exit. Press F12 key at “TOSHIBA” logo screen to toggle between the bootable devices and choose the medium which you want to boot from.If you were a complete nugget like me, you can lock up the BIOS all together, in which case you have to remove all power (AC / Battery) and hold the power button for 20 seconds to hard reset the BIOS. Then access via F2 key immediately Note: Sometimes Hard resetting the BIOS removes the “Secure Boot” featureThis then allows Windows 7 CD Installer to Run if you want to downgrade by pressing F12 and choosing boot medium CD / USB ................
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