Unable to disable secure boot in UEFI Solved

Question

Good evening,

I invite you to help me find a solution to my problem.

I bought a new computer with the Windows 8 (OEM) operating system.
After installing all the updates for Windows 8, the Windows Store allows me to download Windows 8.1, but that’s when the problems start.

The download of the upgrade from Windows 8 to Windows 8.1 downloads correctly, but when the computer needs to reboot, the installation gets stuck with error code "0x80004005".

After browsing Google for hours... I found several solutions suggesting that the problem comes from the infamous secure boot.

To do this, I restart the PC, go into the UEFI, boot icon, and I see the famous secure boot option grayed out (in other words, I cannot disable it).

I have already performed a reinstallation of Windows... but the error is still present. I also entered a password in the UEFI but that doesn't change the problem. Still unable to disable secure boot.

Here are the specifications of my PC

Intel® Core(TM) i7-4770K Processor (4.2 GHz) (4 cores) - Intel Z77 Chipset - 2 TB Hard Drive + 128 GB SSD - 16384 MB RAM - NVIDIA GeForce GTX 690 Graphics Card - 4 GB Graphics Memory - Blu-Ray Writer - 16-in-1 Card Reader - LAN 10/100/1000 Mbps - Wi-Fi - USB 3.0 Port - HDMI Port - Xonar Phoebus Sound Card - 20 Kg - Windows® 8 (64-bit)

If you need more information, don’t hesitate, and thank you in advance for your help :)

angels of death · Accepted Answer

Hello everyone,
On my side, I found a solution to disable the security boot on an Acer PC.
My goal was to install Windows 7 alongside Windows 8.1. To disable the security boot, I simply set a BIOS access password, which then unlocked the grayed-out features and allowed me to disable the security boot.
Gloomtoto
Life is beautiful

Flogger · Answer

Hi

The brand and model of the motherboard are missing.

I'm not sure, but I think the CSM (Compatibility Support Module) needs to be disabled because if CSM is enabled, Secure Boot is not available. This explains why the option is grayed out or "not available."

Phililppe · Answer

Hi, thanks for the reply.

The motherboard brand is Asus, the model is G50AB.

I disabled the CSM but there is no change. Secure Boot is still enabled and greyed out.

I tried reinstalling the upgrade to Windows 8.1 by disabling the CSM, but unsurprisingly, the same result.

ikewdu · Answer

Hello,

Regarding secure boot, I would rather advise enabling "csm". This is what the Ubuntu site and the Asus documentation seem to suggest.

At startup, hold down the F2 key to enter the BIOS, then select "Boot" and set "Launch CSM" to Enabled. Then go to "Security" and set "Secure Boot Control" to Disabled. Press F10 to save and exit the BIOS. While the computer is rebooting, hold the ESC key to open the boot menu.

We'll just have to see what happens afterwards when "csm" is disabled.

As for the W81 installation issue, I don’t think it's related to that. But since I haven't personally migrated to W81, I prefer not to be too definitive. Do keep in mind that some sites mention:

- issues with antivirus (just temporarily removing it should suffice)
- incompatibility of W81 with the motherboard (unsolvable)
- unrecognized drivers (I believe this one is quite unlikely).

tribun · Answer

Hello
But I don't see why we should disable Secure Boot to install Windows 8.1 on Windows 8 when the motherboard on this new computer is UEFI.

He who loves instruction finds knowledge that comes from reflection!
P.S. Frequently create a restore point! It solves quite a few problems.

Carcinos · Answer

I found a way to disable the secure boot state from the UEFI BIOS utility on an ASUS B85M-G. I restored the factory settings, and in the "Boot" menu, the Key Management option appeared (it wasn't there before), so I was able to use "Delete PK," and finally, I got the secure boot state to "disabled"!

oerba34 · Answer

And when you don't have access to boot into the UEFI BIOS?

Unable to disable secure boot in UEFI

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