Safe mode unavailable after enabling secure boot


  1. dexsk
    Posts : 15
    Windows 11 Pro
       New #1

    Safe mode unavailable after enabling secure boot


    Hello,

    I've installed Win10 without UEFI/secure boot (a classic MBR drive with NTFS), a few days ago I used mbr2gpt to convert the system drive to GPT and then enabled UEFI and Secure Boot by enrolling the EFI keys from bootx64.efi in my BIOS. From that point I've lost the ability to boot into safe mode, anytime I try that, it wrecks booting to the point where right after startup it goes into automatic repair and then fails, BCD and Winload missing. I have to repair the EFI hidden partition with diskpart and bcdboot from command prompt inside the recovery environment to be able to boot up normally again, thankfully no install media needed, the bootloader looks unaffected.

    Anyone with an idea on what it's about and how to fix it would be welcome :)
    Thanks

    Dex
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  3. PolarNettles
    Posts : 809
    Win10
       New #2

    Just to confirm, booting in normal mode with secure boot enabled is perfectly fine and it's just safe mode that's problematic?

    Can you try booting to safe mode with logging enabled to see how far it is getting? Enable or Disable Boot Log in Windows Windows 10 Tutorials
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  4. dexsk
    Posts : 15
    Windows 11 Pro
    Thread Starter
       New #3

    PolarNettles said:
    Just to confirm, booting in normal mode with secure boot enabled is perfectly fine and it's just safe mode that's problematic?
    Can you try booting to safe mode with logging enabled to see how far it is getting? Enable or Disable Boot Log in Windows Windows 10 Tutorials
    Hello, my boot log wasn't showing anything unusual. I was able to fix this myself however, the GPT conversion didn't preserve the BCD entries and ReagentC config needed to run safe mode properly, after following the instructions here:
    https://www.winhelp.us/restore-windows-re.html

    I was able to restore the OS as if it came cleanly installed.
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