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So the firmware password isn't the one I entered. To avoid the usual onslaught of insinuations that it 'might not be my computer' that usually accompany questions of this nature, I want to state unequivocally that I am not asking how to bypass it, I'm trying to figure out why, and what (if anything) I can do to restore the EFI so that the password I entered will work. It may seem like a fine distinction, but it's an important one.

The nearest I've been able to ascertain is that the firmware I'm running is not the right firmware for my machine/OS combination. I was looking through the list of firmware updates on the Apple website here: https://support.apple.com/en-us/HT201518 and it seems that I'm running a version that isn't listed. According to the site the version for my machine should be: MBP112.0138.B16 When I look at the system information is says that I am running MBP112.0138.B18

Could that be the issue? If I flash the older firmware will it respect the password or will I still be out of luck?

EDIT:

So in my haste I overlooked the disclaimer on the Apple EFI/SMC Updates page stating "If you don't see a firmware version listed in this article, it means that either a firmware update is only available as an automatic update, or no firmware update is needed."

That answers the question.

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    Pardon the obvious questions, but I take nothing for granted. Have you tried entering your password with an external keyboard? And is any part of your password likely to be affected by modifier keys, keyboard layout, etc? – Monomeeth Apr 8 '17 at 1:02
  • I haven't, but will try it. There's no Unicode. All ascii, of sufficient length and complexity, entered very, very carefully. :) – blanket_cat Apr 8 '17 at 1:05
  • I know this isn't your question, but you're aware Apple can clear it for you, yes? – Harv Apr 8 '17 at 3:08
  • Yes... I am aware that they can clear the password for me.. In an an Apple Store.. Not presently in the US. The only apple store in this country is a days drive and I don't have the resources, So that option doesn't help me disable SIP, so that I can install tools I need for development projects in the immediate. – blanket_cat Apr 8 '17 at 6:24
  • @Harv Can they? – Max Ried Apr 8 '17 at 19:04

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