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How to disable Secure Boot?

Level 7
I`am using Windows 8.1 64 bits and i need to disable SECURE BOOT on BIOS, i`ve tried everything but it seens to not work , i still have the ROG LOGO + Windows loading circle.
How i can def disable it?
I`am using Maximus Vi Hero with latest BIOS.

Level 10
If you want to disable secure boot I THINK you need to:

1. Go to the Secure Boot menu in the BIOS (which I think is located in the Boot Configuration screen of the BIOS); and

2. Change the OS to "Other OS".

However if you want to hide the ROG logo during POST (and I am not sure why you want to do this ....) I think you need to:

1. Go to the Boot Configuration screen of the BIOS; and

2. Change Boot Logo Display to Disabled.
MOTHERBOARD: ASUS Maximus VI Formula (BIOS 0804)
CPU: Intel i5-4670k
HDD 1: Samsung SSD 250G 840BW EVO
HDD 2: Western Digital WD10EZEX 1TB Caviar Blue 7200rpm
RAM: 16gb (2x8) G. Skill RipJawsX DDR3-2133
PSU: Seasonic X-Series 750W 80 Plus Gold
GPU: Gigabyte GV-N770OC-4GD
CASE: Fractal Design Define R4
MONITOR: Samsung S24C300HL; BenQ E2200HD
OS: Windows 10 Professional
Other: MS Wired 600; Logitech MX 310; Sennheiser PC 151 & Logitech Z150

yea but for real how do you disable secure boot i have the g20aJ and nothing is working to disable it. I am trying to make a windows 7 partition in my HD but every time it loads the windows 7 CD it freezes at the logo

Level 7
Having the same major issue! I want to load my new win 7 ultimate, just picked up for $39. Any Bios manual out there for the ASUS G20AJ?

Level 9
I know nothing about your boards, or CPU. Methinks you disable secure boot by...1) not installing a GPT formatted drive, and 2) not installing a GPT drive.

Level 7
In the bios, in the secure boot menu, simply delete the certificates ( or whatever they are called ). If you want to re-enable secure boot simply load the default certificates again.
Win 10 Pro x64
i7 4770K @ 4.6GHz - NH-D14
Asus Maximus VI Hero - 1505
Corsair Vengeance Pro 8Gig
Gigabyte R9 290 unlocked 2816 cu's
Asus Xonar D2X - Stoner Acoustics UD110v2
XFX Pro XXX 650W