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FVE_E_PROTECTOR_CHANGE_MAX_PASSPHRASE_CHANGE_ATTEMPTS_REACHED
What BitLocker has already established
At HRESULT 0x803100C0, BitLocker has determined that BitLocker has throttled password changes after too many failed current-password submissions. The FVE_E_PROTECTOR_CHANGE_MAX_PASSPHRASE_CHANGE_ATTEMPTS_REACHED code does not by itself say that the volume master key is lost or that user data is corrupt.
Operational boundary: key-protector lifecycle.
A BitLocker key protector wraps access to the volume master key. TPM, TPM+PIN, startup key, recovery password, password, certificate and Network Unlock protectors have different volume and policy rules; changing one is not the same as decrypting the volume. Protector inventory should be treated like a set of independent unlock routes. Record protector GUID and type; the presence of a recovery password does not prove that the PIN/password protector being changed exists.
Data to preserve before changing state
Related state to rule out
Do not merge this incident with a device lockout caused by repeated sign-in or preboot attempts; this counter belongs to protector maintenance. If both appear with this result in one trace, preserve ordering because the first HRESULT normally identifies the prerequisite that caused later cleanup or fallback messages.
How to retest without losing evidence
Stop retries, use an authorized administrator reset path, and correct the script or UI that repeats the old password.
manage-bde -protectors -get C:
powershell -NoProfile -Command "Get-BitLockerVolume C: | Format-List KeyProtector,ProtectionStatus,VolumeStatus"State checks specific to FVE_E_PROTECTOR_CHANGE_MAX_PASSPHRASE_CHANGE_ATTEMPTS_REACHED
| Stage | How to interpret it |
|---|---|
| Before the call | Record the target identity and the pre-call key-protector lifecycle state. BitLocker has throttled password changes after too many failed current-password submissions. |
| At failure | Preserve change-attempt events, protector GUID, caller and automation history, timing and whether a stale credential is cached. |
Microsoft references
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