Install Windows 11 on Legacy Bios: no TPM and Secure Boot

by Claudiu Andone
Claudiu Andone
Claudiu Andone
Windows & Software Expert
Oldtimer in the tech and science press, Claudiu is focused on whatever comes new from Microsoft. His abrupt interest in computers started when he saw the first Home... read more
Affiliate Disclosure
  • Although Microsoft doesn't allow it, you can install Windows 11 on Legacy BIOS.
  • With our workarounds, you will also be able to bypass the TPM and Secure Boot checks if you need that.
  • The key is to create bootable media designed specifically for the MBR BIOS settings.
How to install Windows 11 on Legacy BIOS

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By now, there is no secret that we need TPM 2.0 and Secure Boot to install Windows 11, but we already know that we can enable them from the UEFI BIOS Mode.

However, if you have a Legacy BIOS, things get a little complicated because switching to UEFI might get you in trouble and erase your disk so you might not be OK with that.

And even if you do so, you might still not be able to enable TPM 2.0 because you don’t have the chip on your motherboard.

However, we have a workaround that will help you install Windows 11 on Legacy BIOS without TPM 2.0 and Secure Boot checks.

Before we start the procedure, make sure you back up all important data on your drive. Although this shouldn’t affect your files, it’s a recommended step before any such tweaking.

How can I check if I have TPM 2.0?

Although our workaround bypasses the TPM check, it’s still important to know if you have the TPM 2.0 chip in case you want to change your BIOS to UEFI at a later point.

  1. Click the Start button, type cmd, and click on Run as administrator to start Command Prompt with full privileges.
  2. Type tpm and press Enter.
  3. This will start the TPM Management window and you will be able to see the manufacturer information and whether you have TPM and which version.

As you could see, our computer has got the TPM 2.0 chip installed so we can enable it from BIOS to install Windows 11 but this situation could be different for you.

How can I install Windows 11 on Legacy BIOS?

1. Use a third party tool

  1. Download Rufus. Starting with version 3.16, this tool comes with special selection to create a Windows 11 boot media without TPM and Secure Boot checks.
  2. Run the installer and open the software. You can also download the 3.16p version which is portable so you don’t need to install it.
  3. Connect your USB drive, then select the drive from the drop-down menu. If you only have one, it will detect it automatically.
  4. Now click the SELECT button and browse for the Windows 11 ISO file on your PC. If you don’t have one, you can get it from the dedicated Microsoft Download page.
  5. In the Image option, click the drop down menu, and select the Extended Windows Installation (no TPM/no Secure Boot).
  6. If you have a Legacy BIOS, you need to change the Partition scheme to MBR. If you have UEFI, select GPT.
  7. Now, you can also change the volume label and partition system but if you’re not sure what to do, leave the options as they are. Hit the START button in the end.
  8. The tool will create a bootable USB drive that you can use to install Windows 11 on your Legacy BIOS without TPM and Secure Boot checks.

This is the easiest method you can use to install Windows 11 on your Legacy BIOS PC just because this tool comes with the simple option to create the bypass for TPM and Secure Boot checks.

2. Modify your Windows 11 ISO manually

Note icon
For this solution, you will need a bootable Windows 10 USB drive. If you don’t have one, check our article on how to create one.

  1. Download the Windows 11 ISO from Microsoft’s dedicated Download page. If you already have one, ignore this step.
  2. Press the Windows key + E to start File Explorer, look for the Windows 11 ISO file, right-click-it and select Mount.
  3. Browse the new virtual drive, get to the sources folder, right-click on the install.wim file, and select Copy.
  4. Connect your Windows 10 USB drive, browse its sources folder, right click anywhere, and select Paste from the context menu.
  5. Replace the file in the destination folder, restart your PC, and boot with the Windows 10 drive. Don’t worry, by replacing the wim file, you transformed the drive into a Windows 11 kit.

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You won’t need any other modification for this solution because Windows 10 doesn’t check for TPM 2.0 or Secure Boot so you should be good to go.

3. Bypass TPM 2.0 and Secure Boot checks from the Windows 11 setup

  1. Press the Windows key + R to start Run, type regedit, and press Enter or click OK.
  2. Navigate to the folowing director: Computer\HKEY_LOCAL_MACHINE\SYSTEM\Setup
  3. Right click on the right pane, select New, then pick Key and name it LabConfig.
  4. Access the new key, right-click in the right pane and select New, then DWORD (32-bit) Value.
  5. Name it BypassTPMCheck, then create another DWORD (32-bit) Value and name it BypassSecureBootCheck.
  6. Now double-click each of the keys and type 1 in the value field to both, then click OK.
  7. Restart your PC and try running the Windows 11 installer.

This should bypass the TPM and Secure Boot checks but it will still not get you over the Legacy BIOS problem.

You can overcome that only if you create a booting drive for MBR, just like we did in the first solution using Rufus.

How to create a bootable drive using the Windows 11 Media Creation Tool?

  1. Download the Windows 11 Media Creation Tool.
  2. Run the downloaded installer, accept the terms, and click on Next in the folowing window.
  3. Check the USB flash drive mark, then click Next.
  4. Now, connect the USB media, select it from the list, then hit the Next button.
  5. You will need Internet connection for downloading Windows 11. Click Finish at the end of the process.

You can now use the newly created drive to either start the installation from the Windows 11 setup file inside or boot from it by changing the boot sequence in BIOS.

So, this is how you can install Windows 11 without UEFI BIOS and avoid the TPM and Secure Boot checks at the same time.

We remind you that some of the methods provided here can offer you a clean installation of Windows 11 that will delete all your data on the drive.

Plus, history has taught us that during an update or an installation anything can happen so that is why it’s important to perform a data back-up before starting anything. Just use the best backup software in that regard.

If you don’t have a Legacy BIOS, we also have an excellent guide on how to install Windows 11 without TPM that will surely help you.

For any other information or suggestions, you can confidently use the comments section below and write us all about it.

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