Install Windows 11 on Legacy BIOS and no TPM 2.0

This article depicts how you can install Windows 11 on a Legacy BIOS where the system does not support secure boot and TPM or have them disabled. The solution given in this article works 100%, and there are multiple ways to bypass the “this PC cannot run Windows 11” error message.

The moment a new operating system version is released, you can’t wait to get it installed, even though you’ve done it many times before. Hence, in such a situation, you know what kind of problems to expect and what steps to take.

but when you come across an error in installing the operating system, your excitement level drops drastically, similar to what has been seen in a leaked version of Windows 11, in which it displays the requirements of TPM 2.0 and secure boot.

If you’re running a UEFI-based system with a secure boot and TPM 2.0 feature, you can enable these features very easily and most computers are compatible with them.

important: The question of TPM 2.0 is a required feature to install Windows 11 has also been hotly debated, so if you are a user with a Legacy BIOS system and want to install Windows 11 on your computer we got you covered.

also important: The leaked build made one thing clear, that specific build requires your system with TPM 2.0 support which is uncommon for Windows operating system builds.

first, let’s discuss what is the requirement

Windows 11 installation without TPM 2.0 or secure boot on legacy BIOS systems

 Once you have all the above-mentioned requirements, installing Windows 10 on a Legacy Bios system is quite straightforward.

 so what is the solution?  When you create a bootable USB drive of Windows 10, an install.wim file is created inside the source folder. What we are going to do is replace this file with Windows 11’s install.wim from the source folder.

Step 1. Select Windows 10 ISO system image file, and right-click on it. You can then access all the files inside the system image by choosing the Mount option. The Mount option will enable you to access the files in the system image.

Locate the install.wim file located inside the sources folder. Note that this is the file from Windows 11’s ISO image which you need to replace with install.wim of Windows 10 (bootable USB drive). (install Windows 10 to USB drive)

What exactly did we do will be explained in this section.

This will not interfere with the booting process of the Windows 10 USB drive,  all the files which are responsible for the operating system are located inside the install.wim folder. All the files that are necessary for Windows 10 to boot from a USB drive are contained in the install.wim folder, which will not interfere with the boot process. Since we swapped Windows 10’s file with Windows 11, your USB drive will boot Windows 11.

Upon completion of the above steps, turn off your computer, and when it starts up, press the boot device selection key.  You will be led through the installation of Windows 11 by following all the instructions on screen.  this will automatically bypass all the secure boot and TPM 2.0  requirements.  it can be a little confusing as Legacy BIOS supports MBR partition ( the one we see on standard hard disk).

Having UEFI and getting This PC can’t run Windows 11.

There are thousands of people who are trying to install Windows 10 on a UEFI system but getting ahead by this PC cannot run Windows 11.  The workaround described here can be used to install Windows 11 on either a UEFI or Legacy BIOS system. 

  • Create a Windows 11 bootable USB.
  • Making a copy of appraiserres.dll from the ‘sources’ folder of Windows 10 ISO, and pasting it to ‘sources’ folder of Windows 11 ISO.
  • This solution is for clean installation.
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