Use another guide to restore the BCD bootloader on MBR (Master Boot Record) disk. On MBR disks, the Windows bootloader is stored on a separate System Reserved partition, not on an EFI partition (in any case, don’t convert the MBR partition table to GPT until you fix the Windows bootloader !!). Most likely you have a computer with BIOS or Legacy/Compatibility Support Mode (CSM) option enabled in the UEFI settings. If you have an MBR partition table on your disk, this instruction won’t work for your computer. If your disk uses a GPT partition table, follow the steps below in the instructions to repair the Windows EFI bootloader. After booting into the recovery environment, you need to open a command line: select System Restore – > Troubleshoot-> Command Prompt).
To repair the bootloader configuration (BCD), you have to boot from the original installation Windows 10 media (or a recovery disk or a special UEFI bootable USB flash drive).
Let’s move on to the procedure for manually restoring the EFI Windows bootloader on a computer with UEFI. Using BCDBoot to Manually Repair EFI Bootloader in Windows 10
When trying to boot the computer, the following BSOD (Blue Screen of Death) error appears: The boot configuration data for your PC is missing or contains errors. The boot configuration data for your PC is missing: EFI\Microsoft\Boot\BCDĪ computer with Windows 10 installed in native UEFI mode will fail to boot if the EFI bootloader is corrupted.