This command formats the EFI partition's target directory, recreates the necessary BCD files, and links them perfectly to your OS partition. Phase 4: Fixing Corrupt System Files & Boot Loops
If fixing the BCD does not restore functionality, file system corruption or damaged core operating system files may be locking the boot process. 1. Run Check Disk (CHKDSK)
If the boot files are fixed but the server still crashes during boot, you can perform an "In-Place Upgrade" (Repair Install). This reinstalls Windows system files but keeps your files, settings, and applications intact.
bootsect /nt60 SYS /mbr
Select as the target operating system.
bcdboot C:\Windows /s Z: /f UEFI
Use Windows Server 2012 R2 installation media (ISO or bootable USB). Set the server BIOS to boot from this media. windows server 2012 r2 boot repair
Phase 2: Repairing the Master Boot Record (MBR) and Boot Sector If you suspect the boot code itself is corrupted, use the
If the directory or BCD is completely corrupted, back up the old BCD and use the bcdboot command to generate a fresh one from your main Windows directory (usually C:\Windows ): ren BCD BCD.bak bcdboot C:\Windows /s S: /f UEFI Use code with caution. Step 3B: Repair Boot Files for Legacy/MBR Systems
If your server uses (not UEFI), run:
Note the volume letter assigned to this partition (e.g., S: ).
Repairing a Windows Server 2012 R2 boot failure typically involves using the to rebuild the Boot Configuration Data (BCD) or revert problematic updates. 1. Access the Recovery Environment
Look for the volume with the label or type "NTFS" and the size of your C drive. Often it’s D: or E: in WinPE. Assume it’s D: in the following commands. 3. Run against that drive: This command formats the EFI partition's target directory,