Recovery Mode Locked

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When I use the Command - R function, my mac presents a grey screen with a lock in the center and a space to enter a password - presumably the admin/root password. When the admin password is entered nothing happens.
 

chscag

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Your Mac's Specs
2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
We need more info about your Mac: Year and model? Version of OS X? In the meantime it sounds like you're being confronted with a firmware password. Where did you get this Mac from?
 
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Your Mac's Specs
Silver M1 iMac 512/16/8/8 macOS 11.6
Sounds like Filevault strikes yet again? Filevault equires a different password from Admin password. Have a look at this:-
 
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MacBook Pro 15" - 2.53.Ghz Intel Core 2 Duo -Late 2008 model running Yosemite. FileVault is disabled.

Thanks!
 

chscag

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Your Mac's Specs
2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
Thanks for the specs about your MacBook Pro. However, it still appears that a firmware password has been set. Is this machine one which you just purchased used?
 

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