![]() In case if you have ever taken a backup of your Windows system, now it is the time it might come handy. I was able to fix my “Boot Manager missing” issue via this command. Post this, do a restart and you should be able to boot into Windows. Use the following command to create a new file. Now, that we have renamed the old BCD file, we need to recreate a new file afresh. Run the following commands to export and rename the old BCD configuration file. Again, you would have to head over to the command line in the Startup Repair options. ![]() Before we begin creating a new configuration file, we will have to find and rename the old one. The Windows BCD file is the one that informs the bootloader about the location of the boot files and other boot-time configurations. We will rebuild the Windows BCD (Boot Configuration Data) file via the command line. If the Startup Repair doesn’t work for you and you end up on the following screen, click on Advanced Options again. If the command works, you will have a prompt stating “Windows Installation: 1” and asking you to add it to the BCD file. In my case, the scanned Windows Installation number is 0 because I’m using a GPT partition scheme and this method is for older MBR partition type. The next command will rebuild the BCD (Boot Configuration File). ![]() On the command prompt, type the following command. Mostly, you would be on GPT partition and UEFI, hence head over to Step 4. The bootrec command only works on BIOS type Windows installation or MBR partitioned disk type. You can also resort to other GUI-based tools like EaseUS, MiniPartition which internally performs the same task. It is a native Windows command-line tool to rebuild and fix the Boot Manager files. On the command prompt, we will try to fix the Windows boot files using the bootrec utility. Now, from the Advanced Options menu, click on Command Prompt. Click on Windows 10 and let the Startup Repair fix the issue. Since it’s a Windows 10 bootable USB, the target OS will be Windows 10. The startup repair Window will ask you for the target operating system. On the Advanced startup screen, click on Startup Repair. Next, click on Troubleshoot to see more advanced options. On the installation window, you would see a small link called “Repair your computer”. Once your system boots the Windows 10 Bootable drive, click on Next. You can do that by pressing Ctrl+Alt+Delete or just long-press the power button. Insert the bootable USB drive in your PC and restart the system. Foremost, we would need a Windows bootable USB which can be made using the Windows media creation tool or a third-party USB bootable software. Rare are the chances that the startup repair would work but we will still go through it as it leads to the second step. Additionally, GPT supports much more partitions and disk size as compared to MBR. GPT is more robust than MBR and also stores copies of the boot files at various locations. ![]() In case you are unaware of GPT, it’s a new partition scheme adopted by Windows 10. This ensures that GPT partitioned drives work and Windows 10 boots irrespective of the boot device order. Make sure the boot mode is set to UEFI instead of Legacy and secure boot is turned on. Moreover, you also get a Boot Manager missing error if your boot mode is set to Legacy. In my case, I am booting from a WD SSD and hence I have set it to the first position in the boot order. Now, change the boot order and bring your SSD or HDD at the top. Next, restart your device and press F2 until you reach the BIOS settings. However, mostly, to reach the BIOS settings, force shut down the device by long-pressing the Power Button. Now, every device has its own BIOS menu and yours would certainly differ from mine. To change the storage device boot order, we have to head over to the BIOS (EFI Firmware Settings!). Boot Orderįirst and foremost, you need to make sure you are booting from the correct storage device. It’s just that the file is missing and we will try to rebuild it through the following process. Missing boot manager doesn’t necessarily mean that your Operating System has been erased. Hence, when the boot manager goes missing, the system doesn’t know what to boot and the other boot file locations. In simple words, the boot manager is the file that posses the location of the Operating System that has to be booted. In Windows 10, the boot manager is an application that stores boot environment variables and boot file locations. How to Fix “BOOTMGR is Missing” in Windows 10īefore we begin, let’s understand what is Windows Boot Manager.
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