How to revert from UEFI back to BIOS...

Hey there.

I had an application that needed me to switch to UEFI and stupidly I did so without doing any research.

I've looked at everything and can't seem to find a way to go back to BIOS, I've seen that switching to UEFI can put your information at risk and I'm quite worried and want to switch ASAP. I reset my computer fully, hoping that it would revert back to the old settings but it hasn't.

Could someone please help me out? Thank you.

Take a look here : https://www.diskpart.com/gpt-mbr/upgrade-bios-to-uefi-1004.html

Regarding your computer reset, this operates on the disk (HDD, SSD), but the BIOS and the UEFI are stored in a specific chip on the motherboard, so that's why it didn't revert the modification.

Feel free to share the model of your motherboard

Edited by Chiragroop, 23 April 2024 - 01:26 AM.

Take a look here : https://www.diskpart.com/gpt-mbr/upgrade-bios-to-uefi-1004.html
 
Regarding your computer reset, this operates on the disk (HDD, SSD), but the BIOS and the UEFI are stored in a specific chip on the motherboard, so that's why it didn't revert the modification.
 
Feel free to share the model of your motherboard

Does the computer not boot?

Switching to UEFI shouldn't put your information at risk.

Can you explain what steps you took to switch to UEFI? Modern motherboards offer a Legacy option for booting a MBR disk in BIOS mode. It can be called CSM mode. Some motherboards can automatically detect if the boot disk is MBR or GPT.

The thing is if you originally were in BIOS mode and switched to UEFI the computer would not boot because a MBR disk required for BIOS will not boot if switched to UEFI.

What is the make and model of your computer?

Click on System BIOS, then select Boot Settings. In Boot Settings, you'll be able to select BIOS or UEFI under Boot Mode

I think you are confused what UEFI is vs what the "Bios" actually is. UEFI is the newer version of the older bios chipset and with more modern advantages. https://www.redswitches.com/blog/uefi-vs-bios/#:~:text=The%20main%20difference%20between%20UEFI,more%20advanced%20graphical%20user%20interface.

What process did you do to switch to UEFI? Did you use MBR2GPT and disabled Legacy Boot/CSM?

You can check how your computer is booted by going to Start > searching for "msinfo32" > and it should show BIOS mode being UEFI or Legacy.

Oh wow the advantages are definitely better, would you recommend not changing?

I think you are confused what UEFI is vs what the "Bios" actually is. UEFI is the newer version of the older bios chipset and with more modern advantages. https://www.redswitches.com/blog/uefi-vs-bios/#:~:text=The%20main%20difference%20between%20UEFI,more%20advanced%20graphical%20user%20interface.

All I did was restart in advanced mode so it took me to advanced start up options & then clicked switch to UEFI firmware.
Also, my BIOS mode is UEFI.

What process did you do to switch to UEFI? Did you use MBR2GPT and disabled Legacy Boot/CSM?

 

You can check how your computer is booted by going to Start > searching for "msinfo32" > and it should show BIOS mode being UEFI or Legacy.

Edited by user20920222, 23 April 2024 - 06:11 PM.

Hey there, I quoted above how I switched to UEFI.
Here's my motherboard model: https://prnt.sc/YtlRhg9VaFYO

Can you explain what steps you took to switch to UEFI? Modern motherboards offer a Legacy option for booting a MBR disk in BIOS mode. It can be called CSM mode. Some motherboards can automatically detect if the boot disk is MBR or GPT.

 

The thing is if you originally were in BIOS mode and switched to UEFI the computer would not boot because a MBR disk required for BIOS will not boot if switched to UEFI.

 

What is the make and model of your computer?

You were already using UEFI mode. The boot to UEFI firmware just takes you to the UEFI screen if you want to change settings.

Oh...How strange, I thought every computer was just automatically in Legacy BIOS. Would you recommend changing or keeping UEFI?
Thank you.
 

You were already using UEFI mode. The boot to UEFI firmware just takes you to the UEFI screen if you want to change settings.

Don't change it. Stay with UEFI.