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I need to enter recovery mode and finally remembered my firmware password using the magic at https://www.cnet.com/news/use-the-calculator-to-reveal-a-macs-firmware-password/

but the padlock screen won't let me enter anything, not even move pointer with the mouse. How can I enter my firmware password?

  • Booting normal I have full access to the keyboard and mouse. And this is quite weird since I use the keyboard to try and enter recovery and it managed to take me to the padlock screen. – Charles Spencer Oct 1 '18 at 14:17
  • Are you trying with a wireless keyboard or a USB connected keyboard? – jksoegaard Oct 1 '18 at 18:21
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answered at https://forums.macrumors.com/threads/firmware-padlock-screen-wont-accept-password.2144758/#post-26602612

Removed a memory stick and rebooted into recovery and from there I was able to remove the firmware password (which recovery didn't see as being active, so I created a new one and then disabled it)

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