attrib bcd -s -h -r (removes system, hidden, and read-only attributes). ren c:\boot\bcd bcd.old . bootrec /rebuildbcd .
If Startup Repair fails, the BCD is likely severely corrupted. Rebuilding it manually using is the most powerful fix. windows server 2012 r2 boot repair
Realizing the or Master Boot Record (MBR) was likely corrupted, Alex opened the Command Prompt from the Advanced options menu. It was time for the heavy hitters: attrib bcd -s -h -r (removes system, hidden,
Rebuild the BCD: