Mbp hash crack

Hi I’ve a mbp model-A1278
emc-2554
serial-c02J725JDTY3
its efi locked ..I have the hash,,how do I go about getting the password from the hash??
sorry for the ignorance I am new to all this 
many thanks for any help I receive 
Oh and just to clarify that I removed the hard drive to replace with bigger gb which is why I’m locked out of it-I am second owner and as such don’t have proof of ownership to take it to apple 
it is not stolen 
cheers
hash is
C02232200L8F1YL18B5E4BE7584FC4415