Secure Boot is a security feature that helps to ensure that only trusted applications are installed on the computer.

The error mainly appears when TPM is disabled on your machine.

What Causes the “Secure Boot State Unsupported” Error?

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It is one of the minimum requirements to install Windows 11.

You could expect your gear to slow down or even crash on a frequent basis.

But before doing that, view Secure Boot’s current state.

Secure Boot State in System Information

Once you’ve enabled Secure Boot, take a stab at install Windows and test whether the problem continues.

If yes, then try the next solution on the list.

Check and Enable TPM Support

You must have the TPM chip installed on your box to download Windows 11.

Restart Now option next to Advanced Startup

The problem in the discussion can also appear if TPM is disabled on your machine.

To enable TPM, follow the below instructions:

cycle your setup and check for the problem.

Choose UEFI as the BIOS' Mode

Windows supports two BIOS modesUEFIandLegacy.

Enable Secure Boot in BIOS

The difference between these two modes is in the process that the firmware uses to locate the boot target.

The solution, in this case, is to convert the partition style from MBR to GPT.

But before doing that, you must check your machine partition style.

Prepare the TPM in TPM Management Window

Windows will start converting the partition style.

The process may take some time, depending on the size of your drive.

Perform a Clean Boot

Are you still facing the “Secure Boot state unsupported” error?

UEFI Option in BIOS

If yes, then you will have to perform a clean boot to troubleshoot the issue.

Check out our guide onhow to perform a clean boot on Windowsfor more information.

In the clean boot state, peek if you’re facing the warning pop-up again or not.

Properties option in Disk Management tool

If not, then it indicates that one of the services you disabled was causing the problem.

Fortunately, you’re able to quickly troubleshoot this error by following the above fixes.

Partition Style in Disk Management

Validate command option in Command Prompt

System configuration window on desktop