What is the goal? The goal is to free the innocent person our Fu@#$%& up criminal justice system has imprisoned! It can take 2 to 20 years (or more) to prove innocence in a court after a wrongful conviction. Therefore, get the prisoner out first, and then litigate innocence. Note, this cannot be done in Delaware, California, or Colorado, [an asinine rule] because you cannot apply for clemency/commutation while having any litigation pending attacking your conviction.
Check eligibility in the state where the person is imprisoned; it varies from state to state. And if not eligible, sue the Governor and others [Board members], arguing that their system is unconstitutional because it precludes the actually innocent. Due Process.
Here is a perfect example of why I wrote this!
READ my article Practical Tip on Pardons, Expungements, Commutations/Clemency: