Bitlocker in combination with TPM is very secure protection. It is uncrackable as far as i know.
Did you secure your systempartition or data partition?
You can add PIN or TPM protection or both
You can delete PIN or TPM protection or both
But of course that's only possible if you have access to the drive (and you can't because of TPM problem)
Never activate TPM security in bitlocker. Activate it only if you want to prevent stealing of your harddiskdata.