I have macbook pro   i got it from craiglist, when i was updating the oprating sestem its asking me for sestem unlocking pin? where can i get it from?

i have macbook pro   i got it from craiglist, when i was updating the oprating sestem its asking me for sestem unlocking pin? where can i get it from?

I would recommend wiping the system and reinstalling the OS for any used system. OS X does not have any "unlocking pin" of sorts so this may be from some third-party software on the system. The system does have a "firmware password" option that can be set to prevent booting to alternative boot environments (ie, external hard drives, safe mode, etc), but this will not prevent system updating.

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