What does HRESULT 0x803100B3 (FVE_E_NOT_ALLOWED_TO_UPGRADE_WHILE_CONVERTING) mean?

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Description:

BitLocker cannot be upgraded during disk encryption or decryption.

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FVE_E_EDRIVE_INCOMPATIBLE_VOLUME	FVE_E_EDRIVE_DV_NOT_SUPPORTED

FVE_E_NOT_ALLOWED_TO_UPGRADE_WHILE_CONVERTING

Why this is not a generic disk error

The practical meaning of FVE_E_NOT_ALLOWED_TO_UPGRADE_WHILE_CONVERTING is that a BitLocker metadata upgrade was requested while encryption or decryption conversion is still active. The HRESULT is 0x803100B3.

Three decisions before remediation

Is the result target correct?: For this result, use the volume or protector GUID and confirm its role; do not rely only on a drive letter or friendly name.
Is the result request allowed?: For this result, resolve effective policy, Windows edition, caller token and management source for the volume state and geometry operation.
Is the result state stable?: For this result, record conversion, protection, lock and reboot status before modifying anything.

Note: The BitLocker provider tracks encryption conversion, protection, lock state, metadata version, filesystem geometry and outstanding volume use independently. When diagnosing this result, remember: Two volumes can both appear “encrypted” in a UI while being in very different states for a management API. Note: Avoid “repair” commands until the filesystem, partition and BitLocker metadata layers have been distinguished. When diagnosing it, remember: A change at the wrong layer can remove evidence or make recovery harder.

Why a common workaround is wrong

This should not be diagnosed as an old metadata version by itself; upgrade becomes eligible only after conversion reaches a stable state. That nearby condition needs a different corrective action and may produce a similar user-facing message.

Confirm the returning layer

record conversion state and percentage, paused/resumed status, volume metadata version and outstanding reboot or repair events. Keep the full HRESULT and the first method that returned it because later cleanup calls can report a different state.
capture manage-bde -status and the protector inventory for the exact volume GUID, not only the drive letter, because letters can change in WinRE, clusters and deployment environments.
Export BitLocker operational events for the result failure and note the boot session, caller identity and management source; that evidence separates this BitLocker condition from a generic access or storage error.

manage-bde -status
powershell -NoProfile -Command "Get-BitLockerVolume | Format-List *"

Correct the configuration deliberately

let conversion complete or return to a documented stable state, verify health and recovery, and then run the upgrade once.
After correcting the result prerequisite, refresh protection, conversion and lock state before one controlled retry; a cached UI message is not proof that the condition is still active.
Before a it remediation deletes protectors, changes firmware mode, resizes partitions or decrypts a production drive, verify that an independent recovery method is available and escrowed in the intended directory or account.

Treat it as a state label rather than a complete recovery plan. Confirm a successful retry with an updated BitLocker state query and a verified recovery path.

State checks specific to it

Checkpoint	How to interpret it for it
Before the call	Record the target identity and the pre-call volume state and geometry state. The decisive boundary is that a BitLocker metadata upgrade was requested while encryption or decryption conversion is still active.
At failure	Preserve conversion state and percentage, paused/resumed status, volume metadata version and outstanding reboot or repair events. This proves whether it came from BitLocker itself or from a wrapper translating another result.
After correction	Let conversion complete or return to a documented stable state, verify health and recovery, and then run the upgrade once. The request should then advance without removing an unrelated recovery route.
After reboot or remount	Recheck protection, conversion and lock state for it; a successful management call is incomplete if the next boot cannot unlock the volume.

Verification after the change

Success means more than the absence of a dialog. Confirm that the condition represented by it now matches the intended design, that the protector inventory has not lost an independent recovery route, and that the next reboot or remount can unlock the volume. If the request advances to another HRESULT, record both values in order because that transition reveals the next unmet prerequisite.

References

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