Pattern to record: The device is healthy but unlock fails after account, TPM or hardware change.

Identify the storage layer

BitLocker is an encryption layer, not a file system. The NTFS-specific checks here apply only after the authorised volume is unlocked and its underlying format is confirmed; retain the recovery key before firmware or hardware changes. One possible explanation is that the data remains encrypted because the authorised key path is unavailable.

Protect data before repair

Never clear TPM or format the volume while recovery information is uncertain. There is no legitimate technical shortcut around strong encryption.

Evidence to check on the protected copy

1. Confirm ownership and recovery credentials before testing metadata or hardware changes.
2. Verify credentials, protectors and recovery records before metadata repair.

Recovery and verification

If the checks support this cause, restore authorised key access or recover with the valid recovery credential. Verification should cover authorised unlock, restart, file access, backup and recovery-key documentation.

For an assessment of your encrypted Windows computer, contact AEPC in Burswood or call 027 908 8880. Provide the model and the conditions that reproduce this problem. Workshop visits are by appointment.