Solved：BOOTMGR Is Missing in Windows 10 after Cloning – 6 Ways

User Case

BOOTMGR is short for Windows Boot Manager which refers to a small piece of software that is loaded from the volume boot code. It enables you to boot Windows 10/8/7 or Windows Vista operating system. Usually, the BOOTMGR file is read-only and is locating in the boot directory of the partition which is set as "active".

As in the case above, there are also many users who reported that they had issues with the Windows Boot Manager missing from BIOS after cloning. The most common causes of BOOTMGR errors include file corruption, configuration errors, hard drive and operating system upgrade issues, hard drive sector corruption, booting from the wrong hard drive, and more.

How to Fix BOOTMGR Is Missing After Cloning?

“Boot Manger is missing” in Windows 10 issue usually appears shortly after the computer is turned on, immediately after the Power On Self Test (POST for short) is complete. This is a very common problem and affects both SSDs and hard drives equally the same whenever one drive is copied to another. Now that you've seen what might be causing this issue, let's discuss practical solutions to fix this error.

Method 1. Restart the Computer

If you encounter BOOTMGR is missing in Windows 10 after cloning, you can try restarting your computer first. Press Ctrl + Alt + Del or any key as prompted by the error message. Then, check if this error is resolved by this method. If not, try the methods below.

Method 2. Remove All Removable Media

Check your optical drive, USB port, and floppy drive for media. Typically, a "BOOTMGR is missing in Windows 10" error occurs when your PC tries to boot from a non-bootable disk, external drive, or floppy disk. If this is the problem, remove all removable device and make sure your BIOS doesn't load from either. Then restart your computer to see if the problem is resolved.

Method 3. Check the Boot Sequence in BIOS

If the “Windows Boot Manager missing from BIOS” still occurs, you should consider checking the boot sequence in BIOS. Assuming you have multiple drives, you may be booting from the wrong hard drive. To do this, follow the steps below:

1. Restart your computer. When the computer starts to boot up, press a special key (usually F2, F8, F10, F12, Esc or Del, etc.) to enter BIOS Setup.
2. In BIOS Setup window, navigate to Boot tab. Modify the boot order to set the cloned hard drive as the first boot device. Press F10 to save the settings and exit. Finally, restart your computer.

Method 4. Perform A Startup Repair of Windows

There is a general solution to the BOOTMGR problem. You can perform a Startup Repair in Windows 10, which can help you replace any missing or corrupt files, including BOOTMGR. You'll need to insert your Windows DVD or USB installation media and launch the Repair utility.

1. Insert a Windows installation disc or bootable drive into your computer. If you don't have Windows install media,you can create a bootable USB.

Note✍: You may need to go into your computer's BIOS to change the boot order so that your DVD or USB drive will boot before the cloned hard drive, otherwise you won't be able to boot from the Windows installation media to fix the "BOOTMGR is missing in Windows 10" error.

2. Boot the computer from the disc or drive and click "Repair your computer" to enter the Windows Recovery Environment. Then select Troubleshoot -> Advanced options -> Startup Repair.

3. Windows will scan your cloned hard drive and automatically detect damaged or missing boot sectors, and will apply the appropriate fixes.

Method 5. Rebuild the Boot Configuration Data (BCD)

If you see BOOTMGR is Missing in Windows 10 or similar message early in the boot process, you may have a BCD issue. A corrupted or incorrectly configured BCD could cause BOOTMGR error messages. Fortunately, this Boot Configuration Data (BCD) can be reconstructed with a few commands and the Windows installation drive.

1. Insert Windows installation disk or the bootable media to your PC and restart the PC from it, click Repair your computer. Then select Troubleshoot -> Advanced Options -> Command Prompt.

   

2. In the Command Prompt, type in the following commands one after the other and press Enter after each command:

• bootrec /fixmbr
• bootrec /fixboot
• bootrec /scanos
• bootrec /rebuildbcd

3. After the process is complete, exit and restart your computer. See if “BOOTMGR is missing in Windows 10 after cloning” issue is resolved.

Method 6. Perform A Clean Installation of Windows

If none of the above solutions work when trying to fix the Windows Boot Manager is missing issue after cloning, performing a clean installation of Windows to fix this error is a good way to go. A fresh install returns your computer to almost the same state it was in the first day you turned it on.

Note✍: It will completely remove Windows from your PC. All data will be deleted, so you'd better back up important files before reinstalling the operating system.

1. Boot your computer from Windows 10 installation disc. In Windows Setup window, enter your language and other preferences and click Next. Then, click Install now.

2. Then enter the product key (you can also skip it directly) and select the version of Windows 10 you want to install. Next, select the Windows installation type.

   

3. Select the drive where you want to install Windows 10 and click Next. Wait for the installation process to be done.

Best Free Disk Cloning Software – No Boot Issue or Data Loss

As we all know, Windows does not come with cloning software. If we want to migrate the system to another hard drive, we can only resort to third-party cloning software. According to some users, when cloning a disk with tools such as Acronis True Image, Macrium Reflect, etc., they will encounter the problem of BOOTMGR is missing in Windows 10 after cloning.

In this case, I recommend you to use a more reliable hard drive cloning software – AOMEI Backupper. It has all the features a normal user needs and is very simple to use. When cloning the disk on which the operating system is installed, the boot partition including boot.ini, NTLDR, BCD, winload.exe, and MBR is also cloned. It’ free for Windows 11/10/8.1/8/7/Vista/XP. Let's see what advantages it has.

✡ Intelligent Clone: It allows you to clone only used sectors from one hard drive to another while skipping bad sectors, so you can easily clone a disk to a smaller SSD or clone a disk with bad sectors without any obstacles. Bad sectors of the hard drive will lead to Windows Boot Manager missing from BIOS.
✡ All Kinds of HDDs and SSDs: It applies to clone all kinds of HDDs and SSDs, regardless of disk size, disk interface, and its brands, such as, clone large HDD to smaller SSD, clone HDD to Samsung SSD, clone M.2 SSD, clone NVMe SSD, etc.
✡ SSD Alignment: This feature makes full use of 4k technology that can help you improve the performance of SSD disk.
✡ Sector by sector clone: This feature requires that the destination disk size must be equal to or larger than the source disk, and it will need more cloning time and disk space.

Detailed Steps to Clone Hard Drive via AOMEI Backupper

Here we will use AOMEI Backupper Standard Edition as an example to show you how to perform disk clone step by step. Before we start, you need to download, install and open this software on your computer.

1. Select Clone from the left-hand side menu and then select Disk Clone.

✩ Tip: If you only want to clone the OS, you can upgrade to the professional edition and enjoy the System Clone feature. It will automatically select the System drive and related drives by default.

2. Select the source disk containing Windows 10 and click Next.

3. Select the destination disk to which the source disk will be cloned and click Next. It will prompt you that the target disk will be formatted and any existing data will be overwritten! You can back up important files beforehand.

4. Preview the information of your source and destination disk. In the bottom left corner, set the advanced settings you want. It is best to clone by sector, otherwise, the system files and the system partition may not be on the same disk or lost. Finally, click Start Clone. Wait for the process to complete and then click Finish.

 ✸ Edit Partitions: You can adjust the size of the partitions on the destination disk if it's larger. It supports 3 options and only the first one is free. The other two options are available on the professional version or advanced.

To Sum Up

Hope you can solve the "BOOTMGR is missing in Windows 10 after cloning" problem with the methods provided in this article. For the long-term consideration, so that you are no longer troubled by these system problems, it is recommended that you use AOMEI Backupper to protect your computer and system.

It embeds the latest cloning technology to clone a hard drive to another drive in a fast, safe and easy way. You can successfully boot from the cloned disk without any boot problems. You can also use it to create system backup when your computer is running fine. If you are unfortunate enough to experience the BOOTMGR is missing in Windows 10 after cloning or other system problems such as “Protection definition update failed on Windows 10”, you can use this backup to restore your computer to a previously working state.