"Extra quality" could refer to pre-processing. The standard tool extracts raw data. A so-called high-quality version might:
bitlocker2john.exe -i encrypted.drive > bitlocker_hash.txt
john --format=bitlocker bitlocker_hash.txt
In some unofficial builds or forum threads, "extra quality" could indicate: bitlocker2johnexe extra quality
The standard tool extracts the recovery password hash, but that hash is derived from a 48-digit numeric recovery password. The entropy is ~128 bits, but the key derivation is slow (up to 1 million iterations of PBKDF2-SHA256 in modern BitLocker). An "extra quality" tool does not speed up cracking; only John/Hashcat and faster hardware do. "Extra quality" could refer to pre-processing
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