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Message 11 of 41
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Impossible to Disable Secure Boot

I talked to support and they want me to send the laptop back for repair, I explained the issue, but apparently they want to see with their own eyes.  Maybe they will realize that this is a real problem and update their code or bug that is causing this behavior.  I will keep everyone posted.

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Message 12 of 41
31,091
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Impossible to Disable Secure Boot

Hi

 

In the OP you say this

 

With now everything set up as much as the BIOS allows me to enable Secure Boot, I Exit and Save. The cpu restarts and prompts me to validate a 4-digit code to enable Secure Boot. I do so. The computer restarts and seems to be booting the USB stick but immediately returns the following error message.

 

Secure Boot

Selected boot image did not authentica​te.

 

 

WHY?

 

If you want to disable secure boot did you enter a 4 digit code to enable it?

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Message 13 of 41
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Impossible to Disable Secure Boot

I realize this is an old thread but it comes up high in search results and there is no real answer posted. I struggled with this at a client site for way too long and finally got a real answer.

TL;DR

Numlock doesn't activate and when prompted for a 4 digit password the machine actually rejects you and settings don't save.

Use the number keys instead

 

Long version

 

Prob
On an HP with UEFI, settings revert back when trying to disable secure boot
Error msg - Selected boot image did not authenticate
 
Cause
NUMLock not being engaged when system prompts for 4 digit code upon boot
and/or
Fast boot is ENABLED
 
Solution
1 - DISABLE Fast Boot
AND
2 - Either use the number keys or hit NUMLock and THEN use number pad

HP should show numbers entered, "sing" some audio, and then UEFI settings should stick

 

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Message 14 of 41
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Impossible to Disable Secure Boot

I have some of these units to image. I found from BIOS go to Security and uncheck System Management Command. Then go into Advanced and Boot option, uncheck fast boot. Next go into Secure Boot Configuration. Enable Legacy support and secure boot disable. Also uncheck Enable MS UEFI CA key. Then save and exit.

 

Do not press any keys on the restart. It will prompt you to enter a four digit code. Once you enter it and press enter it will restart again. Then you can use esc to bring up other menu options such as pxe boot and the boot menu.

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Message 15 of 41
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Impossible to Disable Secure Boot

I followed your instructions, but did not receive a prompt for the 4 digit code. As such, everything was returned the way it was, and I still can't push a build thru PXE. I've seen this code once before on a buid I created earlier, but now it won't come up. What am I doing wrong?

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Message 16 of 41
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Impossible to Disable Secure Boot

Update to the latest "BIOS" (UEFI really), reset to defaults, and try the instructions again?

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Message 17 of 41
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Impossible to Disable Secure Boot

Yeah. Nice thought, but it's aready been done this morning. Thanks for the suggestion tho. Keep 'em coming.

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Message 18 of 41
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Impossible to Disable Secure Boot

Haha. What model are you working with?
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Message 19 of 41
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Impossible to Disable Secure Boot

The HP ProBook 450 G3.

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Message 20 of 41
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Impossible to Disable Secure Boot

I had the same problem with a Pavilion Mini 300-030.  I used the steps given (Win + I, Power, hold Shift while clicking Restart) to get into the Advanced menu.  Went into UEFI to change secure boot.  Told me to restart to change it.  When I restarted, it gave me a code and said "enter code and hit Enter to change boot security" or such.  On restarting went into BIOS and was able to change settings using SIDE ARROW KEYS!  Turned on Legacy and turned off Fast Boot and upon restart F12 and PXE worked.

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