A client forgot their BitLocker password but wrote down the recovery key somewhere? You can extract the recovery hash and attempt to crack it if the recovery key was generated from a predictable pattern (unlikely). Better to use actual recovery key if available.
Try mounting the drive in Windows first (if possible) to force metadata visibility? Not usually effective. The drive may be using a newer BitLocker version not supported (check JtR version). bitlocker2john.exe
For TPM-only drives (no password, no PIN), bitlocker2john.exe cannot extract a usable hash because the decryption key never leaves the TPM without the original hardware. In such cases, forensic acquisition requires live-system access or other methods outside this tool's scope. A client forgot their BitLocker password but wrote