How to fix bootrec.exe /fixboot access denied error Windows 11

When restoring the system boot using bootrec /fixboot commands, users receive a “Access Denied” message instead of the expected boot fix.

Fix bootrec.exe /fixboot access denied :

• Enter the commands
  diskpart
  list volume
• Check the number of FAT32 partition with loader and current Windows partition letter.
• Select the partition with the bootloader and assign to it a letter using
  select volume N
  assign letter=BOOKBA
• Specify the partition number instead of N and any unused drive letter as a letter.
• Enter exit command to quit DISKPART.
• Use command (if needed, change C and Z to the letters of system and loader partition in your case):
  bcdboot C:\windows /s Z: /f UEFI