In the case you encounter a Windows 10⁄11 install using Master Boot Record (MBR) and need to convert it to GPT. This might be neccessary if you want to run UEFI for BitLocker.

  • Open CMD as Administrator (elevated command prompt)
  • Validate the command
MBR2GPT /validate /allowFullOS
  • Run the conversion, this shouldn’t take long.
MBR2GPT /convert /allowFullOS
  • Restart Computer into Bios and enable UEFI.