A client's wife lost her iphone(in the house) and stupidly did an icloud lock on the account, locking out all 6 apple devices they had. Upon finding her phone, they used the 4 digit pin to unlock 5 of the devices, the macbook pro was left alone and continued to not be touched for a week. When the macbook pro was started up after a week and the 4 digit pin was entered, it failed to unlock and stated the pin was invalid. Instead of calling me, they removed the macbook pro from the icloud account and the "apple store techs"(if that's what you call them) could not unlock the efi nor 4 digit icloud lock still present. The apple store pretenders told the client to go someplace else because the macbook pro is older than 5 years. There is data on the drive that needs to be recovered, the drive is not readable when attached to another mac. removing ram and holding down command + option + p+ r results in efi lock screen. The data is the most important, I have access to knoppix if I have to perform some forced mounting to force the disk to be writable. The efi lock needs to go, this is a 2010 macbook pro, not an air. Data needs to be pulled, and probably a fresh OS install, if the EFI can be removed.