How can i fix this Secure Boot Violation (Unauthorized change)

Question

How can i fix this Secure Boot Violation (Unauthorized change)

Hime 21

Lately today i decided to conver my disk from mbr to gpt, when the process finally finished it just restarted and i was welcome with a red text that says Secure Boot violation, The system found unauthorized changes on the firmware, operating system or uefi drivers.
I really don't want to format my hard disk or buying another one, the quick solution would be just reinstalling Windows again but i have files that i want to keep. I just tried to disable Secure Boot and it just shows a black screen. I don't know what to do.

Reza-Ameri 17,341 Reputation points Volunteer Moderator

2022-03-07T15:43:05.243+00:00

How did you perform this action?
Did you use any script?
If yes, please share it.
Hime 21 Reputation points

2022-03-07T17:47:04.487+00:00

MiniTool Partition Wizard mbr to gpt tool.
Reza-Ameri 17,341 Reputation points Volunteer Moderator

2022-03-08T16:10:32.817+00:00

It is recommended to do not use the third-party tools
Benito José Santiago Martín 0 Reputation points

2024-12-21T20:01:49.6966667+00:00
Create a new bootloader partition using a Windows USB Bootable device. Click troubleshoot> command prompt diskpart

list disk

select disk N (N is the number of the converted GPT disk)

list partition

select partition n (n represents the number of the partition to shrink)

shrink desired=500 (shrink the partition by 500MB)

create partition primary size=500

format fs=ntfs quick

active

assign letter=F

exit

bcdboot C:\Windows /s F: /v (replace C with the drive letter of the partition containing the Windows directory)

Accepted answer

1 additional answer

Your answer

Reza-Ameri 17,341 Reputation points Volunteer Moderator

2022-03-07T15:43:05.243+00:00

How did you perform this action?
Did you use any script?
If yes, please share it.
Hime 21 Reputation points

2022-03-07T17:47:04.487+00:00

MiniTool Partition Wizard mbr to gpt tool.
Reza-Ameri 17,341 Reputation points Volunteer Moderator

2022-03-08T16:10:32.817+00:00

It is recommended to do not use the third-party tools
Benito José Santiago Martín 0 Reputation points

2024-12-21T20:01:49.6966667+00:00

Create a new bootloader partition using a Windows USB Bootable device. Click troubleshoot> command prompt diskpart

list disk

select disk N (N is the number of the converted GPT disk)

list partition

select partition n (n represents the number of the partition to shrink)

shrink desired=500 (shrink the partition by 500MB)

create partition primary size=500

format fs=ntfs quick

active

assign letter=F

exit

bcdboot C:\Windows /s F: /v (replace C with the drive letter of the partition containing the Windows directory)

Answer 1

Boot to the BIOS:

https://www.disk-image.com/faq-bootmenu.htm

Once in the BIOS see if you can disable secure boot.

And see what happens if you boot using each:
Legacy
UEFI native (without CSM)
UEFI hybrid (with CSM)

Find a flash drive that you can format (> or = 8 GB).

On a working computer create a bootable Windows 11 iso:

https://www.tenforums.com/tutorials/2376-create-bootable-usb-flash-drive-install-windows-10-a.html

https://www.elevenforum.com/t/download-official-windows-11-iso-file-from-microsoft.1009/

https://www.microsoft.com/software-download/windows11

Find a camera or smartphone camera to take pictures and post images or share links into this thread using one drive, drop box, or google drive.

On the problematic computer boot to the Windows 11 iso > click troubleshoot> command prompt > type these commands:

bcdedit /enum all
bcdedit | find "osdevice"

diskpart
lis dis
lis vol
sel dis 0
det dis
lis par
sel par 1
det par
sel par 2
det par
sel par 3
det par
sel par 4
det par
sel par 5
det par

Post images or share links of the commands with results into this thread.

.
.
.
.
.

Please remember to vote and to mark the replies as answers if they help.

On the bottom of each post there is:

Propose as answer = answered the question

On the left side of each post there is /\ with a number: click = a helpful post
.
.
.
.
.

Answer 2

When the computer is powered on are you able to boot Windows or open safe mode?

Can you boot to the BIOS and turn off secure boot?
This is for an Asus computer:
https://www.asus.com/support/FAQ/1042711/

https://www.tenforums.com/tutorials/85279-enable-disable-secure-boot-windows-10-pc.html

When there are computer problems it is often possible to save important files and install a fresh version of Windows.

This can be accomplished either by booting to Windows or Windows Recovery Environment (RE).

When booting to Windows RE > perform a custom install (not clean install)

If possible post images or share links for any error messages or codes.

.
.
.
.
.

Please remember to vote and to mark the replies as answers if they help.

On the bottom of each post there is:

Propose as answer = answered the question

On the left side of each post there is /\ with a number: click = a helpful post
.
.
.
.
.

Hime 21 Reputation points

2022-03-07T21:40:01.137+00:00

Sadly i'm not able to boot up in windows, when i disable secure boot i just get a "_" blinking in the screen.

Share via

How can i fix this Secure Boot Violation (Unauthorized change)

1 additional answer

Your answer