Need to remove EFI lock, how to?
How can I remove the EFI lock without send-ins or expensive tools? MacBook came from Goodwill, so it was untested. Any help would be appreciated.
Your only option is brute force, running through all of the likely code sets and hoping.
@guardian10 Well, low level programming is somewhat more complicated than Html and requires a tool to interface with the Efi IC, that means more money into the project, with uncertain outcome. Soldering a new preprogrammed Efi IC, which you could find for sale at some eBay sellers, would be the cheapest alternative. But it's a delicate chip, it would need good soldering tools and extensive experience on board repairs. These are the alternatives, which one to choose or just give up is up to you, your selfconfidence and costs involved.
If you just want to reformat the hard-drive (losing all the data) and re-install a fresh copy of MacOS you might be able to achieve this by putting it into DFU mode, depending on what machine it is.
Check out this guide: https://mrmacintosh.com/how-to-restore-b...
I recently did this for a 2018 MBP and can confirm it works. Might need to try the configurator steps a few times, it seems to be unreliable.
If it was donated and has an EFI password it might also be enrolled in MDM, in which case you should read through this guide BEFORE installing a fresh version of MacOS:
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