Windows 11 BitLocker Fatal Error 0x120 After Update + Hibernate — What Fixed It

[garronsc1]

 

I ran into a Windows 11 boot failure after an automatic Windows update. The laptop initially worked after the update, but later I put it into Hibernate to move locations. When I turned it back on, it failed with:

BITLOCKER_FATAL_ERROR
0x120

The system would not boot normally.

What did not fix it by itself

These did not fix the issue by themselves:

sfc /scannow /offbootdir=C:\ /offwindir=C:\Windows
DISM /Image:C:\ /Cleanup-Image /RestoreHealth
chkdsk C: /f
Deleting C:\hiberfil.sys
Startup Repair
Uninstall latest quality update

The Windows partition was still readable from recovery, and BitLocker could be unlocked with the recovery key, but the machine still would not boot.

What finally fixed it

The successful fix was to remove both the BitLocker/TPM problem and the stale hibernation resume state.

In my case, that meant:

Delete hiberfil.sys
Fully decrypt BitLocker
Remove the BCD resumeobject
Delete the Resume from Hibernate BCD entry
Cold boot normally
Disable hibernation after Windows boots

Deleting hiberfil.sys alone did not fix it, but I still consider it part of the fix because the original failure happened while resuming from hibernation.

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Fix steps

I did this from Windows Recovery / Windows USB Command Prompt.

1. Confirm the Windows drive

dir C:\Windows

In my case, Windows was on C:. If your Windows folder is on a different letter in recovery, use that letter instead.

2. Unlock the BitLocker drive if needed

Check status:

manage-bde -status C:

If the drive is locked, unlock it with the 48-digit recovery key:

manage-bde -unlock C: -RecoveryPassword YOUR-48-DIGIT-KEY

3. Delete the hibernation file

attrib -h -s C:\hiberfil.sys
del C:\hiberfil.sys

If the file is not found, that is okay. It may already be gone.

4. Fully decrypt the drive

manage-bde -off C:

Then monitor progress:

manage-bde -status C:

The important lines are:

Conversion Status
Percentage Encrypted
Protection Status
Lock Status

The goal is:

Conversion Status: Fully Decrypted
Percentage Encrypted: 0.0%
Protection Status: Protection Off
Lock Status: Unlocked

At one point, my decryption appeared stuck at the same percentage. Running this kicked it back into progress:

manage-bde -pause C:
manage-bde -resume C:

Then I waited until the drive was fully decrypted.

5. Assign a drive letter to the EFI/System partition

diskpart
list vol

Find the small FAT32 EFI/System partition, then assign it S::

sel vol X
assign letter=S
exit

Replace X with the volume number for the EFI partition.

6. Check the BCD for hibernation resume entries

bcdedit /store S:\EFI\Microsoft\Boot\BCD /enum all

In my case, the Windows Boot Loader had a resumeobject, and there was also a full Resume from Hibernate section.

That matched the history of the failure: the machine broke when trying to resume from hibernation after a Windows update.

7. Remove the stale hibernation resume pointer

bcdedit /store S:\EFI\Microsoft\Boot\BCD /deletevalue {default} resumeobject

8. Delete the separate Resume from Hibernate BCD entry

In the bcdedit /enum all output, find the section named Resume from Hibernate.

It will have an identifier like:

identifier              {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}

Delete that entry:

bcdedit /store S:\EFI\Microsoft\Boot\BCD /delete {GUID-FROM-RESUME-FROM-HIBERNATE-SECTION}

Replace {GUID-FROM-RESUME-FROM-HIBERNATE-SECTION} with the actual identifier from the Resume from Hibernate section.

9. Reboot

After full BitLocker decryption and removing the hibernation resume entries, Windows booted again.

10. After Windows booted, disable hibernation

From an Administrator Command Prompt:

powercfg /h off

I also left BitLocker off for the time being, created a restore point, and planned to fully update Windows before considering whether to re-enable device encryption.

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My conclusion

In my case, this appeared to be a bad interaction between:

Windows update
BitLocker / TPM validation
Hibernate resume
BCD resumeobject / Resume from Hibernate entry

The working fix was:

Delete hiberfil.sys
Fully decrypt BitLocker
Remove the BCD hibernate resume references
Cold boot normally
Disable hibernation

This is not guaranteed to fix every BITLOCKER_FATAL_ERROR 0x120, but it resolved mine when Windows was still readable from recovery and the failure began immediately after trying to resume from hibernation.