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I have a 27” iMac which is locked with a firmware grey screen and padlock, I cannot boot into disk utility to put my computer back to factory settings using command and R as I don’t know the password.
iMac 27", macOS 10.13
Apple say:
If you forgot your firmware password
If you can't remember your firmware password or passcode, schedule an in-person service appointment with an Apple Store or Apple Authorized Service Provider. Bring your Mac to the appointment, and bring your original receipt or invoice as proof of purchase.
How to set a firmware password on your Mac - Apple Support
Apple say:
If you forgot your firmware password
If you can't remember your firmware password or passcode, schedule an in-person service appointment with an Apple Store or Apple Authorized Service Provider. Bring your Mac to the appointment, and bring your original receipt or invoice as proof of purchase.
How to set a firmware password on your Mac - Apple Support
removing a firmware padlock on my imac 27”
