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The MacBook Pro 2014 (macOS High Sierra, A1502) I’m using has a firmware password set. I tried to boot into target disk mode and it asks for this password even after turning it off/on. I tried many key combinations, SMC reset, cmdoptionPR, etc, none of which worked.

I just want to boot from the main drive again so it works as usual. Is there anything I can do apart from waiting until Monday to resolve it at my school? I need this thing for the weekend.

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You'll need your firmware password to boot into anything other than macOS (which is why it's called a firmware password). If you can't remember your firmware password your only real option is to take your computer to the Apple Store. I believe I read online somewhere they'll have a special key or something like that so you can go in and reset your firmware password or remove it, then you'll be able to boot into target disk mode.

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    Also, an Apple Store (or authorized service provider) should require you to provide proof of ownership before they'll reset the firmware password. The firmware password is a security feature, and it's designed to be hard to bypass. – Gordon Davisson Apr 20 '18 at 16:21
  • Thanks for your answer. As I mentioned, I want to boot macOS but I can't find a way to reset the boot order without the firmware password. I don't own this computer nor set the password. – elauria Apr 22 '18 at 11:58

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