6e3umec

There is easier way to change disk format from MBR to GPT:
1. Open Windows PowerShell (with admin permissions)
2. Insert
mbr2gpt.exe /convert /allowfullOS
3. Wait till disk will sucessfully change format to GPT.
Done. Now your disk format should be GPT and boot mode is UEFI.
If it's not UEFI, just change it in BIOS (from LEGACY to UEFI).