Chosen Solution

I have a fresh harddrive i want to install because im using my original in my PC. But when i came to try and reinstall OSX by holding Option while booting, i remembered i have an EFI code and completely forgot it. I went on EBAY and purchased a new EFI programmed chip that works with my model and it needs to be soldered on which im so-and-so experienced with but can get the job done correctly. Will this work? Or will i have to ship the chip back? Thanks for your replies!

Why or how did your EFI chip get locked? Apple will gladly unlock it for you for free. All you have to do is show proof of purchase.