How to change BIOS from UEFI to Legacy on HP Pavilion sleekbook 14

[PraveenRK]

Hi friends,

I have HP Pavilion sleekbook 14 and is running Win10 x64 with UEFI mode and secure boot ON.

I would like to rebuild it "Legacy" BIOS mode and disable Secure boot.

I entered into BIOS But I can't find where to change BIOS mode to legacy. All I could find is "Legacy mode" enabled/disabled. But If enable it I am still in UEFI mode.

BIOS version is of 2013 (never updated - will do now).

Thanks!!

[CF4]

Hi

You want to disable Secure Boot?

Wipe the UEFI/GPT Hard Disk setup?

Enable Legacy Mode and create an MBR onto the HDD?

Then install a new Operating System, for what reason?

[PraveenRK]

Yes for all your 3 questions.

I want to do it for experimental / educational purpose now please answer actual question. thanks!

[CF4]

Hi

OK:  Lesson 1

You want to disable Secure Boot?

Wipe the UEFI/GPT Hard Disk setup?

Enable Legacy Mode and create an MBR onto the HDD?

Then install a new Operating System, for what reason?

There you go.

Note the strikethrough's.

[PraveenRK]

Did you even read my question?

In entire BIOS, I can't see where I can change BIOS mode to legacy except for "Legacy mode" with "enabled/disabled" option. it was set to "disabled" which I changed to "enabled" but it's still in UEFI mode.

My question again is "how to change bios mode to legacy"?

I already took complete backup of my laptop and prepared a USB with win10 ISO using rufus with "MBR disk with legacy bios". I'm even prepared to press "Shift F10" during install and then run diskpart to convert GPT disk to MBR.

Now if you understand my question AND have any useful answer ONLY THEN reply here... thanks!

[CF4]

Hi

You dont seem to understand.

""

I have HP Pavilion sleekbook 14 and is running Win10 x64 with UEFI mode and secure boot ON.

I would like to rebuild it "Legacy" BIOS mode and disable Secure boot.

I entered into BIOS But I can't find where to change BIOS mode to legacy. All I could find is "Legacy mode" enabled/disabled. But If enable it I am still in UEFI mode.

BIOS version is of 2013 (never updated - will do now).""

There is not a question there that I can define.

"In entire BIOS, I can't see where I can change BIOS mode to legacy except for "Legacy mode" with "enabled/disabled" option. it was set to "disabled" which I changed to "enabled" but it's still in UEFI mode."

So you want to change the BIOS to Legacy, you change it to Legacy as you have stated above, and it still has the Secure boot option,.

My BIOS cannot be Legacy, but it does have Legacy Suport.

BIOS was discontinued with Windows 8 when UEFI came in. 

Some UEFI systems have Legacy Support that pretends to be a BIOS.

So if you Enable legacy support as you keep stating that you have done, then you wipe your hard disk and install an MBR system....

[PraveenRK]

Thanks for your detailed reply. Now I understand that there's no option to set legacy BIOS mode but UEFI with legacy support.

I already disabled Secure boot and enabled "Legacy support" however I still can't boot laptop from the Win10 bootable USB ( prepared using Rufus with option of  "mbr partition scheme for bios or uefi-csm" ). However I can boot only from USB prepared with option "gpt partition scheme for uefi".

with my current config, which option of Rufus should I choose to install Win10 on MBR disk?

regards,

[jorkki]

Here's a doc to help you. You need to convert the hd into mbr format:

https://support.hp.com/hk-en/document/c04578208

[PraveenRK]

Hi Jorkki,

I'm not even able to boot from USB ( I tried both USB 2.0 & 3.0 ports)..

Is it possible to convert boot drive from GPT to MBR while OS running?

[jorkki]

You should be able to boot from the USB with UEFI boot manager even if you created it with the option MBR partition for BIOS or UEFI. Just keep hitting Esc when you star and select boot device option from the startup menu.

You need to do the conversion when you are booting with the installation media from the USB.