Cannot disable secure boot to install Linux

[Lilian38]

Hello,

Here is my problem:

I have an Elitebook 850 G6 on which I have to install a Linux distribution (in this case PopOS) in Dual-Boot.

For that I follow the classic procedure, I use rufus to create a bootable USB key. When I plug it on my pc and I try to boot on it I have the following error : "Selected boot image did not authenticate."

I saw that disabling Secure boot could solve this problem so that's what I wanted to do.

I go to the options then I disable the Secure boot, quit and save the changes.

The PC restarts and I type the 4 digit code to confirm the changes, and when I go back to the options I see that Secure boot is not disabled, it reactivates itself so I can't boot on my USB stick....

I've been going around in circles for a while on this problem and I would like your help! Please!

Thank you for your help.

[ub6424]

Hello @Lilian38 

Please follow instructions ...

(1) Download and install BIOS Update using current <Windows>

HP BIOS and System Firmware (R70)

01.21.01 Rev.A

20.3 MB

Aug 15, 2022

Download

Why should you install the update ?

https://support.hp.com/us-en/document/ish_4123786-2338478-16

Quote: "

Updating the BIOS is recommended as standard maintenance of the computer. It can also help resolve the following issues:

• An available BIOS update resolves a specific issue or improves computer performance.
• The current BIOS does not support a hardware component or a Windows upgrade.
• HP Support recommends installing a specific BIOS update.

"

(2) Reboot

(3) Let BIOS be installed until it's completely done !

(4) Download and Install/Update

HP Battery Health Manager BIOS Setting Update

1.0.2.1 Rev.A

0.5 MB

Nov 20, 2020

Download

(5) Reboot and try to disable <Secure Boot> again

(6) Please report your results

[Lilian38]

I followed the instructions and steps to update all my drivers and BIOS.

I have the same problems when I disable secure boot...

It reactivates itself on the next boot.

Thanks for your help but I need more ! :[

[ub6424]

Hello @Lilian38 

If <Secure Boot> is disabled you have to enter a (digit) code at the next startup which is displayed to confirm these changes. Did you do that ?

Kind regards

[Lilian38]

Yes, I enter the 4 digit code, after that the computer reboot and Secure boot is back.

[ub6424]

Hello @Lilian38 

(1) Disable <Secure Boot>, save settings and exit

(2) Send picture of BIOS <change request> (4 digit code) <- random code, no sensitive data !

Kind regards

[Lilian38]

First, I change from the state <Legacy Support Disable and Secure Boot Enable> to <Legacy Support Disable and Secure Boot Disable>.

Then I save.

And there is the change request (I just type the 4 digit code and press enter).

 After that, the computer reboot and Secure boot is back ! :[

[ub6424]

Hello @Lilian38 

Please choose:

Legacy Enable and Secure Boot Disable

Save and exit, try again ...

Kind regards

[Lilian38]

Hello,

I have already tried with this option, same problem...

[ub6424]

Hello @Lilian38 

Our options are exhausted. Unfortunately, I cannot help you any further.

HP warranty valid -> Contact HP Support

Good luck