How to Easily Fix Asus Secure Boot in Windows 11 not Working

You can learn why Asus secure boot in Windows 11 not working and how to fix the problem as well as the stepwise guide to clone MBR to GPT. You can read on to know more detailed information.


By Clytze Updated on November 10, 2022

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User Case: Asus Secure Boot in Windows 11 not Working

“I'm trying to set secure boot on Asus b450m-a motherboard to be able to use Win 11. I have tried various combinations of CSM settings and Secure Boot settings but haven't been able to achieve it. The PC Health App tells me that TPM 2 is enabled but Secure Boot isn't.

I tried to update the Bios which was an issue because I was then unable to even boot Windows 11. I fixed that but it’s still not in Secure Boot. It’s also showing me in Legacy mode for Bios which I’m not sure how to change. Any help would be appreciated. Thanks."


If you are also experiencing the problem mentioned in the case, it is because your previous system was installed in traditional Bios mode, but Windows 11 can only be installed in UEFI mode. You can continue reading this article to learn how to fix Asus Bios secure boot in Windows 11 problem.

How to Fix Asus Secure Boot in Windows 11 not Working

MBR and GPT are two different partition styles. And Windows 11 requires your computer to be in UEFI mode to boot normally, which means the disk can only be of GPT partition style. Therefore, when you encounter the "Asus secure boot Windows 11 not working" error, you should convert the disk with MBR partition table to GPT partition table.

The easiest way to convert MBR disk to GPT disk is to use professional disk cloning software, such as AOMEI Backupper Professional. It can help you clone MBR to GPT disk directly, and then you can boot Windows 11 directly from the cloned GPT disk.

  • Clone between different partition styles: You can clone between MBR and GPT disks, so you can easily clone MBR disks to GPT disks. It also supports cloning MBR to MBR as well as cloning GPT to GPT.
  • Intelligent Clone: By default, the software will only clone used sectors on the source disk, so you can easily clone larger drive to smaller drive if you need to.
  • Multiple Windows Operating Systems: Not only supports Windows 11, this software also supports multiple Windows PC operating systems, including Windows 10/8.1/8/7/XP/Vista, etc.

Clone MBR to GPT Step by Step

Next, this article will introduce how to clone MBR disk to GPT with this safe and reliable cloning software. This software has a very concise interface and easy-to-understand operations, even if you are a novice, you can easily complete the entire cloning process. Before you start cloning disks, you need to do some preparations first.

  • Connect the GPT disk to your computer and make sure it is recognized by the computer.
  • Since cloning a disk will erase all data on the target disk, you can backup files to external disk in advance.
  • Download and install AOMEI Backupper Professional.
Download Free Trial Win 11/10/8.1/8/7/XP
Secure Download

Step 1. Open the AOMEI Backupper Professional, click Clone > Disk Clone.

Choose Disk Clone


The Professional edition supports cloning both data disks and systems disks from MBR to MBR/MBR to GPT, or GPT to GPT/GPT to MBR. If you only want to clone data disks, you can pick the complete free Standard edition.

Step 2. Choose the MBR disk as the source disk. Then, click Next.

Select MBR Disk

Step 3. Choose the GPT disk as the destination disk. Then, click Next.

Select GPT Disk

Step 4. Confirm your operations and click Start Clone.

Preview Clone


  • Edit Partitions: You can use this function to change the partition size, and it can help you fully use the disk space.
  • SSD Alignment: This feature can help you optimize SSD performance and give your SSD faster read and write speeds.
  • Sector By Sector Clone: It will clone all sectors, whether they are used or not. And it is available for cloning to disks of the same or larger size. So, you can clone disk to larger disk easily.


This article explains why Asus Secure Boot in Windows 11 working and how to solve this problem. The easiest way is to clone MBR disk to GPT disk by professional disk cloning software AOMEI Backupper Professional, after cloning, you can successfully boot your computer from the cloned disk then solve the Asus secure boot in Windows 11 not working problem.

Besides Disk Clone, it also provides System Clone and Partition Clone to meet your various cloning needs. Its backup and restore functions can also help you protect your data better, you can download this software to explore more useful features.

Clytze · Editor
Clytze, an editor at AOMEI Technology, is passionate about safeguarding your digital world. She dedicates her expertise to empower users like you in data security and recovery. She firmly believes that everyone should have the tools and knowledge to protect their digital assets through computer backup, seamless disk cloning, and efficient file synchronization. Clytze is your trusted guide on the journey to data safety.